Compact light source assembly for a lighting arrangement, especially for macro photography or for close-up moving image recordings.

Abstract

Proposed is an arrangement for a compact light source assembly comprising an LED (1), at least one light-collecting lens (4) arranged downstream of the LED (1), and at least one field diaphragm (5, 5a, 5b, 5c, 5d) arranged downstream of the light-collecting lens (4) with an aperture plane (E). The compact light source assembly is designed with a flat mounting surface (A, AZ) as part of a lens mount (6, 6a, 6b, 6c, 6d) or an extension ring (13) for a commercially available interchangeable lens, and the mounting surface (A, AZ) is spaced downstream of the aperture plane (E) of the field diaphragm (5, 5a, 5b, 5c, 5d) by an effective flange focal distance a_eff. This effective flange focal distance a_eff results from the addition of the nominal flange focal distance a_n according to the specification of a commercial lens manufacturer for the lens mount (6, 6a, 6b, 6c, 6d) and a predetermined depth offset v.This depth offset v represents the deviation from the nominal flange focal distance of the interchangeable lens. The depth offset v is greater than or equal to 0.2 times and less than or equal to 5 times the nominal flange focal distance a_n. A positive value of the depth offset v allows the predetermined reduction of the close focusing distance of the interchangeable lens for imaging the field diaphragm (5, 5a, 5b, 5c, 5d).

Description

[0001] This is a compact lamp assembly for an electrically operated lighting arrangement, which can be used particularly for macro-photographic purposes, i.e., for macro photography, but also for video recordings and professional filming in the macro range, i.e., for moving image recordings. This lamp assembly can be used, for example, for photographing small objects with dimensions well under 40mm. On the other hand, the compact lamp assembly can also be used in a lighting arrangement to illuminate objects at close range during the visual inspection of small object details on large objects or for amateur or professional filming in the field using a video camera, for example, when recording microorganisms. State of the art

[0002] There are no known prior art illuminant assemblies for lighting arrangements for macrophotography purposes or for close-up video and film recordings that are both compact and comparatively cost-effective, while also enabling the sharply defined illumination of a small object or object detail with dimensions under 40mm with a very bright light spot or light field. Furthermore, there are no known compact illuminant assemblies in lighting arrangements that can project a sharply defined light field onto the object at significantly different distances from 40mm to 1000mm from the lighting arrangement with an illuminance of up to 300,000 lux, even while operating on a rechargeable battery.

[0003] The well-known Köhler illumination, see https: / / www.spektrum.de / lexikon / optik / mikroskopbeleuchtung / 2056

[0004] (Accessed 13.10.2023 [1] is designed with a collector, a field diaphragm and a condenser, which is usually either a compact, high-aperture and short-focal-length lens, a two-lens condenser or a multi-lens condenser. Neither a compact, high-aperture and short-focal-length lens, a two-lens condenser nor a multi-lens condenser, which are used in a projector or in a microscope, can produce a bright and sharp image of the field diaphragm, for example, at a free distance of up to 500 mm with an image scale of approximately 1:1. Also, when imaging with a high-aperture and short-focal-length lens, there can be significant aberrations in the edge area of ​​the image of the field diaphragm if the field diaphragm has a diameter of 20 mm, for example.Thus, Köhler illumination with a compact, high-aperture, short-focal-length single lens, or even with a short-focal-length, multi-lens condenser, is generally not suitable for macrophotography lighting setups. Theoretically, with Köhler illumination, the image of the light source is created in the object space at infinity. This is not absolutely necessary for macrophotography or filming, since, due to the typically shallow depth of field in object imaging, it is sufficient if the image of the light source is sufficiently far away from the image of the field diaphragm, meaning that the image of the light source is not visible in the macrophotographic image at the location of the object being recorded.

[0005] Slide projectors have a condenser lens positioned in front of the slide, which in turn is followed by the projection lens. However, a conventional slide projector cannot project a sharply defined light field at distances of 40 mm to 500 mm from the slide projector, with variably adjustable lateral extension. Furthermore, conventional slide projectors use halogen lamps with at least 150 watts, which makes their use for macro photography difficult, if not impossible, due to the air turbulence caused by the ventilation.

[0006] Godox offers the Godox S30 LED light, a system with 30 watts of electrical power consumption for advertising photography or video recordings, see https: / / store.godox.eu / de / sonstige-modifikatoren / 5321-godox-sa-p1-projektionsvorsatz-fuer-s30-6952344218082.htmi

[0007] (Accessed October 13, 2023) [2]. The diameter of the light field in the Godox SA-P1 projection attachment is around 45mm. This light field is sharply projected. This means that a variety of patterns can be projected comparatively sharply using different shading apertures of this size in order to fully illuminate object details in a field of, for example, one square meter. However, even for the Godox SA-03 150mm telephoto lens with a 150mm focal length, the full projected light field is always well above 45mm in diameter. By using a small aperture, a light field in the form of a light spot with, for example, a diameter of only 4mm can be projected, but this will then only have moderately sharp edges and not be very bright. However, these small projected light fields are comparatively weak for use in macro photography.A system based on the Godox S30 LED light is therefore not at all a suitable system for macro photography or for amateur or professional filming in the outdoor field with light fields significantly less than 40 millimeters in lateral dimension and a very high illuminance in the light field.

[0008] Schölly produces the powerful LED light sources FLEXILUX 4000, see https: / / twidoo.at / Schoelly-Flexilux-4000-led?qcelid=EAlalQobChMlicillPz2gAMVypaDBxOm6QZNEAQYAiIABEaldxPD BwE

[0009] (Accessed 13.10.08.2023) [3] with a fiber output. However, these light sources cannot produce a small, sharply imaged light spot at a free working distance of 50 mm.

[0010] The HEDLER Profilux LED650 from Hedler is an ultra-compact LED floodlight with continuous light, see https: / / www.hedler.com / epages / es12071.sf / de DE / ?ObjectPath= / Shops / es12071 / Pr oducts / 5011

[0011] (Accessed October 13, 2023) [4]. This 75W LED floodlight produces bright, daylight-quality light from a powerful LED. However, the HEDLER Profilux LED650 floodlight is not suitable for macro photography, as it cannot produce a small, sharply focused light field at a free working distance of 50mm and a lateral dimension of less than 50mm.

[0012] Patent DE 10 2022 001 895 B3 describes an arrangement for generating a spaced, adjustable light field for macrophotography, in particular for object-adapted illumination with a sharp light field edge. The use of a flexible fluid light guide described therein does not allow for the production of a comparatively cost-effective, compact light source assembly for a lighting arrangement, especially for macrophotography. This is because the distance between the continuous light source with a high-performance single-cell LED and the light field is at least 1.2 meters, which does not constitute a compact arrangement. Only a single lens is arranged in front of the shading diaphragm or the iris diaphragm in the diaphragm tube.

[0013] The invention described in published patent application DE 10 2020 121 652 A1 relates to a main body of image recording devices with an interchangeable lens, mounting devices therefor, and flange focal distance adjustment elements, and in particular to main bodies of image recording devices on which mounting devices are interchangeable. However, this main body of image recording devices does not constitute a lamp assembly. Aim of the invention

[0014] The aim is to teach how a comparatively cost-effective, compact lamp assembly can be put to economic use for a lighting arrangement, in particular for macro photography or for close-up motion picture recordings or for amateur or professional film recordings in the outdoor field with light fields significantly less than 40 millimeters in lateral dimension. Object of the invention

[0015] By means of a lamp assembly integrated into a lighting arrangement, it should be possible to achieve a very high intensity of the light in a projected light field for object illumination for macro-photography purposes, for filming in the macro range, i.e. for close-up moving image recordings or for illuminating objects at close range. The lateral extent of the light field projected onto the object should be adjustable within wide limits, but generally less than 40 mm. The light field should also be able to be focused at different depths in the close-up range above 40 millimeters and below 1000 millimeters free distance, but in particular with a sharp edge. The achievable illuminance in the projected light field on the object should be at least 50,000 lux and up to 500.000 lux or even more if a small light field is projected. In extreme cases, it should be possible to achieve 800,000 lux to 1,000,000 lux in the projected light field, which requires eye safety measures. If possible, there should be no ground glass in the optical beam path of the lamp assembly to avoid attenuating the light. It should be possible to achieve good to very good sharpness of the edge of the light field on the object and a high level of uniformity of illuminance in the sharply defined light field. Furthermore, it should be possible to continuously focus the light field at least over a partial area in depth or to gradually adjust the focus position in depth using technical aids.Above all, the light source assembly should enable flexible adaptation to very different lighting situations in terms of a free working distance from the object being photographed, as well as in terms of the light field size and illuminance. Furthermore, the intensity of the light for object illumination, i.e., the illuminance, should be adjustable within wide limits – at least by electrical means – and adaptable to the respective lighting task. These settings should also be possible via remote transmission in special cases. A mobile phone should also be able to control the illuminance in the light field. Description of the invention

[0016] This is a compact light source assembly for a lighting arrangement, particularly for macro photography or close-up motion picture recordings. The close-up range is defined as the free area equal to or less than 1000 mm between the front mechanical stop of the lighting arrangement and the area of ​​the object closest to the lighting arrangement. The compact light source assembly preferably has an LED or, preferably, a group of LEDs as its light source, which is preferably operated with significantly more than 5 watts of electrical power, including operation with 100W.

[0017] This is based on the common fact that both amateur and professional photographers, especially those who do macro photography, for example in the 35mm format or APS-C format with a macro lens, usually also own a standard lens with a fixed focal length for the 35mm format or APS-C format with a high speed, which is an interchangeable lens. For example, these interchangeable lenses have a speed between f / 1.4, f / 1.8, f / 1.7, f / 2, or even f / 2.8. Such an interchangeable lens is usually unused during macro photography with a standard macro lens and is therefore available. In this case, it should preferably be an interchangeable lens that can also be focused manually, as this simplifies handling if there is no cabling or remote control for the interchangeable lens.The unused standard interchangeable lens in the photographer's equipment for macro photography with a macro lens, for example, for the 35mm format, APS-C format, or even MTF format, can thus be used by the photographer as an interchangeable lens for illumination in macro photography, imaging the edged illuminated field of a field diaphragm. The field diaphragm can preferably be designed as an iris diaphragm. This eliminates the need to provide an additional lens for illumination purposes. However, in this case, the compact illuminator assembly should also be matched to this interchangeable lens and specifically to its flange focal distance. On the other hand, a very inexpensive, commercially available interchangeable lens - for example, a video lens - that does not originate from the 35mm format and is already available or can be acquired very inexpensively can be connected to a compact illuminator assembly.A manual interchangeable lens is highly preferable, especially if there are space constraints with the camera for macro shots. A manual interchangeable lens typically has a smaller outer diameter than a motorized interchangeable lens, and with a manual interchangeable lens, the size of the aperture can usually be manually adjusted—influencing the depth of field when creating a light field for illumination. In addition to the interchangeable lens already mentioned, which is not used here for macro photography, this interchangeable lens can also be an inexpensive, but preferably fast APS-C interchangeable lens or an inexpensive, fast video interchangeable lens with a fixed focal length.It can also be a C-mount interchangeable lens, or in rare cases, a CS-mount interchangeable lens. In this case, the focal length of the interchangeable lens used should generally not be less than 25mm if it is used for macro photography with objects and object details greater than one millimeter. Manual lenses for the APS-C format with a Fuji X-type bayonet can also be considered here, for example, as they can be used advantageously on the lamp assembly due to their small outer diameter.

[0018] While accepting a considerably lower illuminance on the object - in comparison to a fast normal interchangeable lens with a fixed focal length - a commercially available zoom interchangeable lens with a speed of 1:3.5 or even up to 1:4.5, which is also often available to amateur photographers, can also be used successfully, for example when flat, immobile objects with dimensions below 25mm are to be photographed using a camera on a tripod.

[0019] The compact lamp assembly for a lighting arrangement, especially for macro photography or for close-up motion picture recordings, is designed: With a light source, with at least one light-collecting lens arranged downstream of the light source with the front focal plane FE1 and with a focal length f1 and with at least one field diaphragm arranged downstream of the light-collecting lens with a diaphragm plane E.

[0020] According to the invention the light source either by means of a single LED or as a group of individual LEDs or as an LED array or as an LED with a downstream, digitally controllable, spatial light modulator.

[0021] However, it is also possible that the light source is an Ultra High Pressure (UHP) lamp or a halogen lamp.

[0022] The luminous field diaphragm has a diaphragm plane and is preferably designed to be predeterminably adjustable in its optical cross section.

[0023] The compact lamp assembly is designed with a support surface as part of a lens mount for a commercially available interchangeable lens.

[0024] The field diaphragm is Either a lens mount with a flat support surface for a lens shoulder in the design of a standard camera bayonet mount for the 35mm, APS-C, DX, Foveon, or MFT formats, or a lens mount with a flat support surface for a lens shoulder in the design of a standard or formerly standard camera thread mount, particularly for the 35mm format, positioned downstream of the light source. The support surface can also be located on an intermediate ring.

[0025] The lens mount has a generally known nominal flange focal distance a_n as specified by a commercially active lens manufacturer for this lens mount.

[0026] The support surface is mechanically spaced downwards from the diaphragm plane E of the field diaphragm by an effective flange focal distance a_eff. This effective flange focal distance a_eff results from the addition of the nominal flange focal distance a_n and a predetermined depth of field offset v. The depth of field offset v is greater than or equal to 0.2 times and less than or equal to 5 times the nominal flange focal distance a_n, as specified by a current or past commercially active lens manufacturer. Preferably, when attaching an interchangeable lens for the 35mm format or also for the APS-C format to the housing of the compact illuminant assembly, the depth of field offset v can be a maximum of v=200mm.

[0027] Here, a_n is the nominal flange focal distance or flange size specified by the manufacturer for a commercially available camera bayonet mount or a commercially available lens thread mount. This nominal flange focal distance a_n, specified by the manufacturer now or in the past, describes the distance from the lens shoulder to the electronic image sensor or film plane for the standard application of the interchangeable lens in a camera specified by the lens manufacturer as a positive value. A range for the depth of field v that is less than or equal to half the nominal flange focal distance a_n according to the manufacturer's specification is generally still well suited for lighting purposes for a macro lens designed for a camera with a built-in oscillating mirror or semi-transparent mirror and for the 35mm or APS-C format, i.e., one with a comparatively large nominal flange focal distance a_n.Such a macro lens can preferably be attached to the lens mount.

[0028] In contrast, a depth of field v that is less than or equal to 1.5 times the nominal flange focal distance a_n according to the manufacturer's specifications is still well suited for a macro lens designed for a mirrorless camera and for the 35mm or APS-C format. Such a macro lens can preferably be attached to the lens mount.

[0029] The depth of field offset v around v=0, i.e., when the nominal flange focal distance a_n is equal to the effective flange focal distance a_eff, is particularly well-suited for a macro lens, as its optical design is precisely configured for the nominal flange focal distance a_n. On the other hand, macro lenses can also be used with a negative depth of field offset v, in which the effective flange focal distance a_eff is then smaller than the nominal flange focal distance a_n according to the manufacturer's specifications. The effective flange focal distance a_eff can then be reduced to up to 0.8 times the nominal flange focal distance a_n according to the manufacturer's specifications. However, this only makes sense in exceptional cases, as a standard macro lens is usually designed to focus at infinity.

[0030] Therefore, a macro lens is preferably used with a depth offset v=0 or a positive depth offset v on the lamp assembly. A true macro lens is generally defined as having at least a magnification ratio of 1:2 according to the manufacturer's specifications, although many modern macro lenses also have a magnification ratio of 1:1. In contrast, lenses that are not designed as true macro lenses are always operated with a positive depth offset v on the lamp assembly, which is preferably significantly greater than 0.2 times and usually significantly less than twice the focal length of this interchangeable lens.

[0031] The focal length f1 of the light-gathering lens is less than or equal to twice the nominal flange focal distance a_n of this lens mount as specified by the commercial lens manufacturer and greater than or equal to one-third of the nominal flange focal distance a_n of this lens mount as specified by the commercial lens manufacturer.

[0032] The maximum lateral extent of the opening of the field diaphragm is preferably smaller than two and a half times the nominal flange focal distance a_n of this lens mount.

[0033] The light source assembly preferably uses an LED whose visible spectrum is similar to that of sunlight. A Color Rendering Index (CRI) of at least 90, preferably 95 or higher, is useful if the photographer or videographer requires high color fidelity. The LED is preferably lightly structured or even unstructured, thus representing a largely homogeneous surface. This makes it possible to achieve a projected light field with uniform illumination without great adjustment effort and also reduces the requirements for the adjustment accuracy of the LED in the depth of the light source assembly. However, an LED with a gridded structure in the light field can also be used, for example, one with 16 pixels in a 4x4 arrangement.Individual pixels can emit light with a slightly different spectrum, so that the complete superposition of the light from these pixels results in a good approximation to white light.

[0034] Preferably, the field diaphragm can be motorized and thus electrically controllable. However, the field diaphragm can also be designed as an electrically controllable liquid field diaphragm.

[0035] It is advantageous for beam shaping in the lamp assembly and also for the utilization of light energy if the diagonal or diameter of the LED is significantly smaller than the nominal flange focal distance a_n of a lens mount on the compact lamp assembly. The LED can be operated with an electrical power of up to 100 W. Preferably, the diagonal or diameter of the LED can also be smaller than a quarter of the nominal flange focal distance a_n of a camera mount of a camera with a built-in mirror.

[0036] A commercially available interchangeable lens is located downstream of the lens connection on the lamp assembly. This interchangeable lens can be referred to here as a field diaphragm imaging lens, as it serves to image the field diaphragm in the function of a projection lens. This interchangeable lens can either as a standard camera lens or as a standard video lens or as a standard film lens or as a standard magnifying lens be formed on the compact lamp assembly.

[0037] Therefore, the photo, video, film, or magnifying lens in this case cannot be a macro lens. Nevertheless, it is preferably used for close-up projection, for which the commercial manufacturer's optical design is not actually intended, since the manufacturer's specified minimum focusing distance for these lenses is usually greater than 7 to 10 times their lens focal length. The reduced imaging performance resulting from this obvious mismatch—for example, at an object distance of less than three or four times the focal length of the photo, video, film, or magnifying lens from the field diaphragm—can in many cases be accepted for the application of illuminating an object with a sharp light field.Even at a magnification of 1:1, moderately sharp images can usually still be produced with a standard or telephoto lens used in photography, video, or reproduction. This is usually acceptable when illuminating an object by projecting the field diaphragm using this standard or telephoto lens, given the achievable edge sharpness of the projected light field. In this case, the focus is usually only on imaging the edge of the field diaphragm, so field curvature or distortion of the interchangeable lens generally does not pose a disadvantage.However, if the imaging quality requirements for the field diaphragm are higher, particularly with regard to chromatic aberrations, a macro lens must be used, or the magnification ratio for projection of a normal or telephoto lens must be limited to greater than 1:2 or 1:3, which, according to the manufacturer's specifications for interchangeable lenses in the photographic field, corresponds to a magnification ratio of 1:0.5 or 1:0.33. In some cases, an achromatic macro lens attached to the photo, video, film, or enlarger lens can also help to slightly improve the imaging performance of this interchangeable lens well below the nominal close-up range.

[0038] A value for the depth of field offset v of 200mm can be useful for macro photography with the illuminant assembly if a telephoto lens with a focal length of, say, 180mm is used to image the field diaphragm, and the object to be illuminated is located approximately 600mm from the telephoto lens, for example, and the image scale for the field diaphragm image should be at least roughly approximately 1:1. This replaces an expensive macro lens with an 180mm focal length.However, with a telephoto lens with a 180mm focal length, the illuminance in the light field can be significantly weaker than with a macro lens with a 180mm focal length, even at the same aperture. This is because this macro lens can be operated with a depth of field offset (v) of zero. This significantly improves the light output, as the rear lens, which acts as the entrance lens, is generally not overexposed if the illuminant assembly is designed for shorter focal length lenses. Using a macro lens also offers significant advantages in terms of focusing and handling compared to a telephoto lens.It should be noted here, however, that when using a zoom lens with a depth of field offset v that is greater than or equal to 0.2 times and less than or equal to twice the nominal flange focal distance a_n and thus its use is completely atypical, a light field can be sharply imaged and focused as an image of the field diaphragm in a comparatively large depth range, for example up to one meter, by adjusting both the zoom focal length and the focusing.

[0039] Furthermore, in exceptional cases, a light diffuser can preferably be arranged between the LED and the field diaphragm in the lamp assembly. The light diffuser can be frosted glass, a ground glass screen, a plastic film, or even a light-diffusing opaque surface. This can further improve the uniformity of light distribution in the light field if very high demands are placed on this. On the other hand, a glass surface of the light-gathering lens can also be finely frosted, for example, if the light-gathering lens is designed as a plano-convex lens. In this case, the flat surface can be frosted. However, a light diffuser is preferably omitted from the compact lamp assembly, as this leads to considerable light loss.

[0040] Furthermore, in the compact lamp assembly for an illumination arrangement with a mirrorless camera-type lens mount, the depth offset v on the compact lamp assembly is preferably specified by a predetermined value that is positive and greater than or equal to 0.3 times the nominal flange focal distance a_n according to the manufacturer's specifications. This applies to APS-C, DX, MFT, or Foveon formats, 4 / 3-inch format, 35mm format, and medium format.

[0041] Furthermore, in the compact illuminator assembly, with a lens mount of the type for a camera with a built-in oscillating mirror or a semi-transparent mirror, the focal length f1 of the light-gathering lens can preferably be less than or equal to 1.3 times the nominal flange focal distance a_n of this lens mount, as specified by the manufacturer. The maximum lateral extent of the opening of the field diaphragm can preferably be less than 1.3 times the nominal flange focal distance a_n of this lens mount, as specified by the manufacturer.

[0042] Furthermore, in the compact lamp assembly, the focal length f1 of the light-gathering lens can preferably be between 10 mm and 40 mm and its numerical aperture can be at least 0.4.

[0043] Furthermore, with the compact lamp assembly, the focal length f1 of the light-gathering lens can preferably be between 18 mm and 28 mm. Lenses in this focal length range are well suited to a lens mount assembly with a nominal flange focal distance a_n between 17 mm and 47 mm, according to the manufacturer's specifications.

[0044] Furthermore, the light-gathering lens in the compact illuminator assembly can preferably be configured with a focal length f1 of 26 mm. The diameter of the light-gathering lens can preferably be 30 mm. Such a lens is available from Thorlabs under the type designation ACL3026U-A and is particularly well suited to a compact illuminator assembly with a lens mount with a nominal flange focal distance a_n between 17 mm and 47 mm according to the manufacturer's specifications, if camera lenses from the 35 mm or APS-C range are to be used for projecting the luminous field lens, although video lenses are not excluded here.

[0045] Furthermore, with a lens mount on the lamp assembly—in the camera design—the depth offset v can be predetermined with a positive value between v=8mm and v=150mm. Within this depth offset range, the magnitudes of the projection magnification betaP_strich can be adjusted within wide limits for projection lenses with a focal length of 50mm to 200mm. With a depth offset v of v=16mm, a magnitude of the projection magnification betaP_strich of roughly approximately 2:1 can generally be achieved with a 35mm format camera lens with a focal length of around 50mm, if the lens is focused on the close-up range.

[0046] Furthermore, with a lens mount on the illuminator assembly—in the design for a camera—the depth offset v can be predetermined by a positive value of v=21.5mm. With this depth offset of v=21.5mm, a magnification ratio betaP_strich of approximately 2:1 can be achieved for a standard photo lens, for example, with a focal length of 55mm, which is used here to project the field diaphragm—also in the form of an iris diaphragm—if the focusing capability of this standard photo lens is also utilized. This magnification ratio betaP_strich of approximately 2:1 results from the focusing capability built into the interchangeable lens, which generally requires a depth shift of at least 8mm for focusing. Setting a depth shift of 6mm results in a focal distance of 21.5mm+6mm=27.5mm for the field diaphragm.This focal distance of 27.5 mm results in a betaP_strich image scale of 55 mm / 27.5 mm = 2:1. As a rule, the image quality of a standard photo lens with a betaP_strich image scale of 2:1 for projection is still sufficiently high when it comes to the requirements of illuminating an object in the macro range. The possibly slight chromatic aberrations in the peripheral region of the light field are still tolerable in most cases for macro shots. For more demanding requirements, this standard photo lens with a 55 mm focal length – with a depth of field of v of v = 21.5 mm – should be focused to infinity, i.e., the depth of field on the interchangeable lens itself should be set to zero. Because with an image scale betaP_strich of 2.6:1, the image quality of a normal photo lens is already slightly better than with an image scale betaP_strich of 2:1.However, at a betaP_strich image scale of 2.6:1, the illuminance is already significantly lower than at a betaP_strich image scale of 2:1, but the field is somewhat larger. If the requirements for the image quality of the light field during projection are even higher, a smaller depth offset v than 21.5 mm must be implemented in the compact lamp assembly.

[0047] Furthermore, the light source in the compact lighting assembly can preferably be assigned a current controller for electrical operation, to which a rechargeable battery is preferably connected. If the light source is designed as an LED, a group of LEDs, or as an LED array, the current controller can be used to adjust the operating current for these LED-based light sources. The rechargeable battery thus serves to electrically power at least one LED. Furthermore, the light source in the compact lighting assembly can preferably be powered with electrical power from a battery unit. This provides the prerequisite for illuminating objects in the open air with the compact lighting assembly.

[0048] Furthermore, preferably, a single LED, a group of LEDs, or an LED array in the compact light source assembly can each be operated with an electrical voltage between 11.5V and 12.5V. An operating voltage of 11.5V to 12.5V for LED 1 is particularly suitable for battery operation.

[0049] Furthermore, the field diaphragm in the compact light source assembly can preferably be designed as a mechanical iris diaphragm or as a diaphragm with sliding diaphragm blades. This allows the size of the field of view to be precisely adjusted to the requirements of macro photography.

[0050] Furthermore, the field diaphragm in the compact light source assembly can preferably be designed with a digitally controllable spatial light modulator. This provides a high degree of flexibility in adjusting the light field and also enables remote control.

[0051] Furthermore, the field diaphragm in the compact light source assembly can preferably be designed as an electrically controllable liquid diaphragm. This also allows for remote control of the liquid diaphragm. Remote control can be either wired or wireless.

[0052] Furthermore, the lens mount for a commercially available or formerly commercially available interchangeable lens for the 35mm or APS-C format can preferably be designed with a bayonet in the compact light source assembly. This can be a Canon EF, Canon EF-S, Canon EF-M, Nikon F, Pentax K, Sigma SA, Fujifilm X, Sony E, Sony Alpha A, Micro Four Thirds, or Leica L-mount. This also includes interchangeable lenses that were once commercially available and are now available secondhand or from private sources.

[0053] Furthermore, the lens mount on the compact light source assembly can preferably be configured with a thread for a currently commercially available or formerly commercially available interchangeable lens. This can be a lens mount for an interchangeable lens with an M42x1, M39x1, M39x1 / 26" (LSM), M39x0.75, M39x0.5, C-mount, or CS-mount thread.

[0054] Here, too, interchangeable lenses that were once commercially available and are now still available second-hand or from private individuals should count.

[0055] The following camera mounts can also be used as connections on the compact lamp assembly for attaching an interchangeable lens: Alpa, Altix V, Altix n / nb, Canon FD and FL, Canon RF, Contarex, Contax G, Contax 645, Contax N, Contax RF, Contax S / Pentacon, Contax / Yashica, Exakta, Exakta 66, Hasselblad 1000 / 1600, Hasselblad V / 500 / 2000, Kiev 60, Kiev 88, Kiev 88CM, Fujica-X, Konica AR, Konica F, Leica (M39 LTM), Leica M, Leica R, Leica S, Mamiya 645, Mamiya ZE, Minolta A (AF), Minolta MD, Minolta SR, Minolta V, Miranda, Nikon 1, Nikon CX, Nikon S, Nikon Z, Olympus E, Olympus Four Thirds, Olympus OM, Olympus Pen F, Pentacon six, Praktisix, Pentaflex 8, Pentax 645, Pentax (M42x1), Pentina, Praktica B, Praktica (M42x1), Praktiflex (M40x1), Praktina, Rollei 35mm QBM bayonet, Samsung NX, T2 (M42x0.75), Topcon RE, Yashica MA, Voigtländer QBM, Zenit, sa https: / / de.wikipedia.org / wiki / Auflagemaß.

[0056] Furthermore, at least one fixed intermediate ring or a variable intermediate ring with a lens connection for an interchangeable lens with a bayonet can preferably be arranged on the compact light source assembly. This allows the effective flange focal distance a_eff to be increased in a few simple steps in order to obtain a smaller or larger amount of the image scale betaP_strich or to advantageously attach an interchangeable lens with a longer or shorter focal length to the compact light source assembly for projection. The advantage is that with an interchangeable lens with a longer focal length, for example with a focal length of 135 mm, a greater free distance to the projected light field can be achieved. This is in comparison to an interchangeable lens with a focal length of 50 mm, for example, if the amount of the image scale betaP_strich is the same in each case.

[0057] Furthermore, at least one fixed or variable intermediate ring with a lens mount for an interchangeable lens with a thread can preferably be arranged in the compact light source assembly. Thus, the effective flange focal distance a_eff can also be increased in order to obtain a smaller image scale betaP_strich or to be able to attach a longer focal length interchangeable lens for projection to the compact light source assembly, which then allows a greater free distance to the projected light field.

[0058] Furthermore, a bellows focusing device with a lens mount for an interchangeable lens of the camera type can preferably be arranged on the compact light source assembly. This lens mount serves to attach an interchangeable lens to the compact light source assembly and can be a bayonet, plug-in, or threaded mount. The bellows focusing device can then, on the one hand, preferably be permanently attached to the compact light source assembly. On the other hand, however, a bellows focusing device with a lens mount in the form of a bayonet or threaded mount can also preferably be attached to the compact light source assembly if the compact light source assembly has a lens mount of the camera type. This bellows focusing device enables very flexible depth adjustment for the interchangeable lens and can be supplied by Quenox.

[0059] In the compact light source assembly, a field lens with a focal length of f2 is arranged downstream of the light-gathering lens. This field lens, together with the light-gathering lens, forms a condenser group that concentrates the light towards the field diaphragm, which can be designed as a mechanical iris diaphragm, a motorized iris diaphragm, a diaphragm with linearly adjustable diaphragm sliders, or a liquid diaphragm. The field lens thus concentrates the light towards the field diaphragm. In this case, a short distance between the field lens and the field diaphragm, for example, 5 mm to 15 mm, is advantageous, as this prevents dust particles on it from being sharply imaged in the projected light field. The field lens can preferably be mounted directly on the mechanical mount of the field diaphragm on the side facing upstream of the light.On the other hand, an interchangeable luminous field lens can preferably also be arranged in order to be able to adapt optimally to the respective downstream interchangeable lens, which can be, for example, a photo lens for the 35mm format with a focal length range between 35mm and 180mm. The interchangeable lens can also be designed for the APS-C format in this focal length range. The interchangeable lens can also be a video lens, which in English-speaking countries is also referred to as a TV lens or CCTV lens, a film lens, or a magnifying lens, and can also be used at a different distance. Accordingly, the effective entrance pupil of this interchangeable lens is also located at a different depth position, which can be taken into account by a luminous field lens with an adapted focal length.It should be noted that in the arrangements described here, the entrance lens is the rear lens when using these interchangeable lenses as standard.

[0060] Older camera lenses are also well-suited as interchangeable lenses for the compact light source assembly, with the Revuenon 55mm f / 1.7 interchangeable lens and the Pentacon 50mm f / 1.8 interchangeable lens being just two suitable interchangeable lenses. A zoom lens can also be used as an interchangeable lens with the compact light source assembly, for example, with a focal length range of 35mm to 70mm, or with a focal length range of 70mm to 200mm, or with a focal length range of 100mm to 300mm. Zoom lenses are particularly well-suited to the compact light source assembly for creating light fields at very different distances from the zoom lens. Due to the completely atypical use of a zoom lens—i.e., far from its nominal flange focal distance a_n—the focal length setting on the zoom lens can also be used to focus the light field for illumination.

[0061] Furthermore, an electrically controllable liquid lens can preferably be assigned to the lens mount in the compact lamp assembly. This electrically controllable liquid lens can be integrated into the lens mount. This also enables remote control of the liquid lens. As already described, remote control can be either wired or wireless.

[0062] Furthermore, in the compact lamp assembly, the LED can preferably be arranged intrafocally in front of the light-collecting lens with the focal length f1 and for the focal distance z1 to the light-collecting lens, the two relationships z1 can preferably be less than or equal to 0.7*f1 2 / f2 and z1 greater than or equal to 0.3*f1 2 / f2 must be maintained. Preferably, the focal distance z1 can be in a range greater than or equal to 2.7mm and less than or equal to 7mm when arranging a light-gathering lens with a focal length f1 of 26mm and a luminous field lens with a focal length f2 of 75mm. Preferably, the focal distance z1 can also be in a range greater than or equal to 3.6mm and less than or equal to 5.4mm when arranging a light-gathering lens with a focal length f1 of 26mm and a luminous field lens with a focal length f2 of 75mm. Adhering to this range can result in a uniformly illuminated light field after an interchangeable lens with an effective flange focal distance of a_eff=65.5mm when an iris diaphragm with a maximum diameter of 20mm is used.

[0063] Furthermore, in the compact lamp assembly, the relationship z1 can preferably be equal to 0.5*f1 2 / f2 must be maintained, where z1 represents the focal distance, which in this case is an intrafocal focal distance. The focal distance z1 for a light-gathering lens with a focal length f1 of 26 mm and a plano-convex luminous field lens with a focal length f2 of 75 mm can also preferably be 4.8 mm. This represents an optimal value for uniform illumination of the light field when an iris diaphragm with a maximum diameter of 20 mm is used. The light-gathering lens here is preferably the aspherical condenser lens type ACL3026U-A from ThorLabs, which has a focal length of 26 mm.

[0064] Furthermore, the luminous field lens in the compact light source assembly can preferably be configured with a focal length f2 of less than or equal to 150 mm and greater than or equal to 18 mm. The shorter the focal length of the luminous field lens, the shorter the focal length of the interchangeable lens attached to the compact light source assembly can be, in order to achieve a good photometric adaptation that enables high illuminance in the generated light field.

[0065] Furthermore, the light field lens in the compact light source assembly can preferably be designed with a focal length f2 of 75mm. This is advantageous if an interchangeable lens is to be used to generate the light field, for example, from the focal length range of 50mm to 135mm.

[0066] Furthermore, the light field lens in the compact light source assembly can preferably be designed with a focal length f2 of 50mm. This is advantageous if a short-focal-length interchangeable lens is to be used to generate the light field, for example, with a focal length of 35mm to 60mm.

[0067] Furthermore, the light field lens in the compact light source assembly can preferably be designed with a focal length f2 of 35mm. This is advantageous if a short-focal-length interchangeable lens is to be used to generate the light field, for example, with a focal length of only 30mm.

[0068] Furthermore, the light field lens in the compact light source assembly can preferably be designed with a focal length f2 of 30mm or 25mm. This is advantageous if a particularly short-focal-length interchangeable lens is to be used to generate the light field, for example, with a focal length of only 25mm.

[0069] Furthermore, electrical means for wired or wireless remote control of a motorized iris diaphragm or a liquid diaphragm can preferably be arranged in the compact illuminant assembly. These electrical means for remote control serve to adjust the free diameter D_F of the motorized iris diaphragm or the liquid diaphragm and the luminous flux of the LED. Thus, the field diaphragm can be electrically operated. For this purpose, an electric motor is arranged in the field diaphragm to operate the diaphragm elements arranged in the field diaphragm. Thus, by wiring the electric motor for adjusting the field diaphragm, which is then designed as an adjustable iris diaphragm, the prerequisites for remotely controlled adjustment of the field diaphragm are also met.

[0070] Furthermore, a bayonet connection with original electrical contacts can also be arranged on the compact lamp assembly. These electrical contacts can then be used to conduct the current for focusing the interchangeable lens to sharply or deliberately blur the image of the luminous field diaphragm, as well as the current for adjusting the aperture diaphragm to adjust the depth of field when imaging the luminous field and its brightness. This bayonet connection with the original electrical contacts is connected to a contact counterpart with a cable connection for connection to an electrical control panel. This control panel can then have a control for the aperture diaphragm in this interchangeable lens and one for focusing this electrically operated interchangeable lens.Preferably, the LED's operating current and the diameter of the electrically operated field diaphragm can also be controlled via this control panel. These controls – similar to knobs – can be mechanically adjustable or located on a touch-sensitive display. This allows for optimal macro lighting adjustment when photographing or videographing live insects or small animals in the wild, even from a distance. This also allows for customized adjustment of the brightness of the light field, both through the LED's operating current and by adjusting the aperture diaphragm on the interchangeable lens of the compact light source assembly, as well as for targeted switching of the light on and off, including short-term exposures.

[0071] The larger the depth offset v is realized in the compact lamp assembly, the smaller the depth range is, as a rule according to the laws of geometric optics, in which the projected light field can still be imaged with a sharp edge.

[0072] The effective diameter of the rear lens of the interchangeable lens, which serves as the entrance lens for projection, is also crucial for achieving high illuminance in the projected light field. However, the size of the aperture of the interchangeable lens is not the only factor. A large aperture, meaning high light intensity, always requires a large effective diameter of the rear lens of the interchangeable lens. Interchangeable lenses with the same aperture ratio can nevertheless have quite different effective diameters of the rear lens.For example, the Zhongyi Creator 135mm f / 2.8 camera lens features a comparatively large effective rear lens diameter of at least 30mm, making this camera lens particularly well-suited for imaging the field diaphragm, even if the diameter of the entrance light beam is of this size. In contrast, the older Revuenon-special 135mm f / 2.8 camera lens, while having the same nominal aperture of f / 2.8 as the Zhongyi Creator 135mm f / 2.8 camera lens, has a significantly smaller rear lens than the Zhongyi Creator 135mm f / 2.8 camera lens. The Revuenon-special 135mm f / 2.8 camera lens has a rear lens diameter of only approximately 24mm.

[0073] Macro lenses typically have a fixed rear lens whose effective diameter is significantly larger than that of a non-macro lens, i.e., with the same nominal light intensity. Macro lenses are therefore particularly well suited for use in compact light source assemblies, even though their aperture ratio is generally significantly lower than that of non-macro lenses, such as standard lenses. Thus, the achievable illuminance in the projected light field using a macro lens can be almost equivalent to that of a non-macro lens, even though the latter has a significantly larger aperture than the macro lens. This can be explained by their atypical use, since the aperture diaphragm always present in macro lenses, standard lenses, or telephoto lenses is not effective at limiting the beam when fully opened; instead, the rear lens mount is.The rear lens of the lens is used here as the entrance lens, since the macro lens or the normal or telephoto lens are each used as a projection lens.

[0074] However, due to the depth offset v introduced here, which is always non-zero, a non-macro lens is not used according to its optical design, and thus its aperture stop does not have to be the effective entrance pupil, but rather the effective diameter of the rear lens, a tendency that increases with increasing depth offset v. However, it can be shown that the image quality in the described atypical use of a macro lens for illumination using a compact light source assembly is still sufficiently good, even outside its specifications.

[0075] For example, the rear lenses of the 7Artisans 50mm f / 1.4 photo lens and the 7Artisans 60mm f / 2.8 macro lens are quite similar in size, despite their very different apertures. Thus, with a magnification ratio of approximately 2:1, the 7Artisans 60mm f / 2.8 macro lens is only slightly less than 20% inferior in terms of achievable illuminance in the light field compared to the 7Artisans 50mm f / 1.4 photo lens, which in no way corresponds to the ratio of the apertures of the two lenses.

[0076] Furthermore, the compact light source assembly can preferably be arranged on a parallel kinematic arrangement, such as a hexapod. This enables the required alignment of the light field for stationary as well as moving objects during filming, video recording, and macrophotography, when a larger object area is to be gradually scanned to locate relevant object areas. However, it is also possible for the compact light source assembly to be arranged, preferably on an angle adjustment system with separate adjustment of the elevation and horizontal angles. Furthermore, the compact light source assembly can preferably also be arranged on a single-axis or multi-axis robotic arm separate from the recording camera in order to allow almost unrestricted access of the lighting assembly to the object to be illuminated.However, it is also possible to arrange the recording camera and the compact light source assembly, preferably together, on a robot arm, whereby the compact light source assembly can also be assigned its own mechanical actuating means.

[0077] Furthermore, an interchangeable lens for imaging the field diaphragm, which can be a camera lens, is preferably assigned at least one additional lens with a focal length between 100mm and 1000mm. This can be a commercially available close-up lens such as those used in macro photography and is a supplementary lens. A focal length of 100mm corresponds to 10 diopters of optical refractive power. Due to this positive refractive power of the additional lens, the sharply imaged light field moves closer to the interchangeable lens for imaging the field diaphragm, which can be advantageous for close-up illumination. The light field also becomes significantly brighter with the additional lens, as the size of the projected light field is then significantly reduced.Preferably, an additional lens, which serves as a supplementary lens, is used with a refractive power between 1 and 3 diopters to minimize chromatic aberrations when imaging the light field. Furthermore, the additional lens can preferably be designed as an achromatic supplementary lens from the Japanese company Marumi, which can then have a refractive power between 3 and 5 diopters. An achromatic supplementary lens significantly reduces chromatic aberrations at the edge of the light field compared to a single lens attached to the front.

[0078] Furthermore, a small shading diaphragm can be arranged in front of the entrance lens of the interchangeable lens, which can also be arranged, for example, at the lens mount of the compact light source assembly. This can create an annular aperture diaphragm. This can be used to adjust the light spectrum if the light color changes across the cross-section of the light beam entering via the entrance lens. For example, if the light in the center of the light beam has a slight red bias. This effect occurs when a gridded LED is used, whose individual elements emit light of different colors. This light is not entirely balanced with regard to white light, and the elements in the center of the LED emit light with a red bias.

[0079] Furthermore, it is possible to integrate the compact light source assembly into an electronic network together with the digital camera for capturing moving scenes in the macro range, for the purpose of controlling the light source current and the opening of the field diaphragm during film or video recordings. Using a computer, the settings of the compact light source assembly can be optimized for the lighting situation by specifying the camera settings for recording. Thus, the camera acts as the "master" for recording, and the compact light source assembly acts as the "slave." The interchangeable lens on the compact light source assembly can also be integrated into this network as a controllable component if its aperture diaphragm and focus can be electrically controlled externally, as is already possible with modern interchangeable lenses.Macro lenses are ideal interchangeable lenses, allowing for a wide depth of focus. This allows photographers, videographers, or film producers to optimally utilize the compact light source assembly, including the motorized and remotely controlled interchangeable lens, in the wild, even in animal dens, depending on the requirements of the shot. The optimal setting of the electrical power supply at the light source, the size of the field diaphragm, the focus of the interchangeable lens, the zoom focal length setting for an interchangeable zoom lens, and the aperture setting of the interchangeable lens can also be optimized during the shooting process using a computer program or artificial intelligence. This allows the photographer to fully concentrate on the subject as well as on creative aspects. Description of the characters

[0080] The invention is achieved by means ofFig. 1 to 17 and five exemplary embodiments without figures, none of which are drawn to scale. Furthermore, in all figure drawings and in the five exemplary embodiments, the focal length f1 of the light-gathering lens 4 is always 26 mm.

[0081] The Fig. Figure 1 illustrates the principle of a compact lighting assembly. The white LED 1, with a square luminous surface measuring approximately 6 mm and a heat sink (not shown here), emits white light and is powered by a powerful accumulator 3 via a current controller 2. The LED 1 is of the type getian-gt-fc40, which has a high color rendering index and operates at a voltage of approximately 12 V. The operating current for the LED 1 can be adjusted within wide limits via the current controller 2, up to 2 A at a voltage of approximately 11.6 V. This current controller 2 is connected to an accumulator 3 and thus regulates the luminous flux emitted by the LED 1 as needed to illuminate an object. The maximum possible current, however, is 4 A at a voltage of 12.5 V. The light from the LED 1 strikes a light-collecting lens 4.This is a short-focal-length, asymmetrical plano-convex lens whose flat surface faces LED 1. This light-gathering lens 4 concentrates the light from LED 1 downwards. LED 1 is positioned in the focal plane FE1 of the light-gathering lens 4, creating the image of LED 1 at infinity, and the focal distance is z1=0. Point PA on the luminous front side of LED 1, which lies on the optical axis OA, therefore coincides with the front focal point F1. The focal length of the light-gathering lens 4 is 26 mm. The sharply edged field diaphragm 5 has an open transmission area with a diameter of 20 mm. The diameter of the light beam is sharply defined by the field diaphragm 5. The light in the opening of the field diaphragm 5 represents a luminous field LF.The distance between the flat surface of the light-gathering lens 4 and the field diaphragm 5 is 27 mm here, which represents an optimal value for the illumination of the field diaphragm 5. The light passing through the opening of the field diaphragm 5 also passes through the lens mount 6, which is designed for the attachment of an interchangeable lens in a camera design. This lens mount 6 has a mounting surface A to which a commercially available interchangeable lens can be flanged. This includes both new lenses and older lenses from second-hand shops, often referred to as "scrap lens." These older lenses are often still available even among amateur photographers. The lens mount 6 with the mounting surface A is arranged here with an effective flange focal distance a_eff of 85.5 mm. The effective flange focal distance a_eff of 85.5 mm results from the nominal flange focal distance a_n, which in this case is a_n=46.5 mm.The nominal flange focal distance a_n is given by the distance from the focal plane A to the point PA. It corresponds to the nominal flange focal distance a_n according to Nikon's company specifications for 35mm format lenses for SLR cameras.

[0082] The luminous field diaphragm 5 with the diaphragm plane E is comparatively far away from the point PA. Thus, there is a significant depth offset v when flange-mounting an interchangeable lens to the mounting surface A. This depth offset v is in this case Fig. 1 v=39mm. This results in an effective flange focal distance of a_eff=86.5mm as the sum of the nominal flange focal distance a_n of 46.5mm and the depth of field offset v of 39mm for a commercially available, low-focus telephoto lens for 35mm format SLR cameras with a focal length of 85mm (not shown here). This telephoto lens, when attached to lens mount 6 with contact surface A, sharply images the edge of the luminous field diaphragm 5 with the luminous field LF, whereby a light field (not shown here) can be created for illuminating an object in macro photography. This aforementioned telephoto lens therefore acts as a projection lens. The luminous field is then enlarged by the amount of the image scale betaP_strich of 2.2:1 with an effective flange focal distance of a_eff=86.5mm when this telephoto lens (not shown here) with an 85mm focal length is set to infinity.The projection scale betaP_strich of 2.2:1 corresponds to a projection scale betaF_strich of 0.45:1 for typical photographic use of the telephoto lens, which, however, was not within the target range of the commercial manufacturer's optical design for this telephoto lens. According to the manufacturer's specifications, a weak telephoto lens for 35mm format with a focal length of 85mm and a maximum aperture of f / 2.0 or f / 1.8 typically has a minimum focusing distance of slightly less than one meter, for example, around 850mm, and is therefore not optically designed for imaging significantly below this minimum focusing distance of one meter.However, since this interchangeable lens is intended solely as a projection lens for illumination purposes and not as a camera lens for image capture, minor imaging errors that may occur in theory and practice, such as minor blurriness, field curvature, and distortion, as well as minor chromatic aberrations that can occur in the peripheral region of the projected light field, must generally be accepted. Field curvature and distortion are of secondary importance here anyway. However, the blurriness in the peripheral region of the light field is generally barely noticeable or not noticeable to a normal eye, even with, for example, 6x magnification at the edge of the light field. The field diaphragm 5 has a diameter of 20mm.These aberrations in the edge region of the light field should therefore generally be tolerable for macro photography with a light field. However, if very high demands are placed on the image quality of the light field to be sharply imaged, an expensive macro lens or a reproduction lens must be used to image the light field—and not a standard lens or telephoto lens outside its specifications. However, the depth of field (v) for a macro lens should then be selected close to zero. However, a macro lens can generally still deliver sufficient image quality for imaging the sharp edge of the light field if the depth of field (v) is not significantly more than one-third of the focal length of the macro lens.

[0083] With the aforementioned projection scale of 2.2:1, a telephoto lens for a 35mm format SLR camera with a focal length of 85mm and a maximum aperture of 1:2.0 can still achieve an illuminance of 150,000 lux in the enlarged light field with a usable area of ​​40mm diameter at a distance of 210mm from the lens mount, provided that LED 1 is operated with an electrical power of approximately 23W, i.e., a current of 2A flows through LED 1 and a voltage of 11.6V is applied. The telephoto lens is set to the infinity position.

[0084] When a 4-diopter achromatic lens is attached to a Zhongyi Creator 85mm f / 2.0 telephoto lens at infinity, the resulting projection scale is 1.25:1, and the illuminance in the projected light field with a diameter of 20mm reaches a value of approximately 350,000 lux at a free distance of 120mm. However, when this Zhongyi Creator 85mm f / 2.0 telephoto lens is set to the close position of 0.85m, a free distance of 105mm follows, and the illuminance in the projected diameter reaches a value of approximately 400,000 lux with a projection scale of 1.08:1 and an electrical power of 23W.

[0085] The Fig. 2 shows a compact illuminating assembly with a lens mount 6a for an interchangeable lens by means of a bayonet, to which a camera lens with an EF mount from Canon can be flanged with its bayonet to form an illumination arrangement. For this purpose, the lens mount 6a is designed with a support surface A. The LED 1, with a heat sink (not shown here) on a tube 7, emits white light, which is close to the spectrum of sunlight, and is supplied with electrical energy via a current controller 2 from a powerful accumulator 3. Here, as in Fig. 1, the white LED 1 of the type getian-gt-fc40 is used, which has a high color rendering index and is operated with a voltage of approximately 12V. The power consumption of this LED 1, which has a square illuminated area measuring 6mm x 6mm, is up to 50W when a current of 4A and a voltage of 12.5V are set. This LED 1 has a gridded structure with 16 individual light fields in a 4x4 arrangement. The operating current for the LED 1 can therefore be adjusted within wide limits up to a maximum of 4A via the current controller 2. The current controller 2 is connected to the accumulator 3 and thus regulates the luminous flux emanating from the LED 1 as required when exposing a photographic object in macro photography or when filming, particularly in the great outdoors.The light from LED 1 strikes a light-gathering lens 4, which is marketed by Thorlabs as an aspherical, anti-reflective condenser lens under the designation ACL3026U-A. This is a short-focal-length, one-sided aspherical plano-convex lens, the flat surface of which faces LED 1. This light-gathering lens 4 has a focal length f1 of 26 mm, a focal length fS1 of 18 mm on the side with the flat lens surface, and an optically usable diameter of 27 mm. This light-gathering lens 4 concentrates the light from LED 1 downwards. The LED 1 is positioned approximately -3.4 mm away from the light-gathering lens 4, i.e., extrafocally, by the focal distance z1. With this value of -3.4 mm for the extrafocal focal distance z1, a fairly uniform illumination is created in the passband of a mechanical iris diaphragm 5a opened to a diameter of 20 mm, which determines the diameter D_F of the luminous field LF in the diaphragm plane E.The distance between the iris diaphragm 5a and the plane surface of the light-gathering lens 4 is 27 mm. The diaphragm blades 5b of the iris diaphragm 5a represent the diaphragm plane E. This iris diaphragm 5a has a maximum diameter of 23 mm and is set here to a diameter of D_F=20 mm, which thus represents the diameter of the luminous field LF in the diaphragm plane E.

[0086] The optimal value for the focal distance z1 of -3.4 mm for good illumination can, however, vary slightly from lens 4 to lens 4 and also depending on the specific design of the compact light source assembly. Therefore, as a rule, a sensitive adjustment of the LED 1 in the depth direction should be possible using mechanical means not shown here when constructing the light source assembly. The diameter of the light beam can be adjusted using the iris diaphragm 5a with the diaphragm blades 5b, which are mechanically adjustable in diameter D_F. The light that passes through the iris diaphragm 5a within the diaphragm blades 5b, i.e., in the free opening of the iris diaphragm 5a with a diameter D_F = 20 mm, enters the bellows close-focusing device 8 and passes through the front-mounted bayonet 6a, which here is designed as an EF bayonet mount from Canon for an SLR camera with a 35mm format sensor chip.The attachment of the bellows close-up device 8 to the tube 7 is also formed by a bayonet connection of the type EF from Canon, which is not shown in detail.

[0087] This bayonet 6a can be adjusted to a depth of up to 100mm using the bellows focusing device 8. Point PA is located on the optical axis OA at a distance of a_n=44mm from the bayonet 6a positioned here, where a_n is the nominal flange focal distance according to Canon's specifications for EF lenses in the 35mm format for SLR cameras.

[0088] However, the iris diaphragm 5a with the aperture plane E is comparatively far away from this point PA, namely by the depth offset v with the value v=67.5 mm. Thus, there is a significant depth offset v to the mounting surface A, to which an interchangeable lens with a Canon EF bayonet can be flanged. This depth offset v is therefore Fig. 2 v=67.5mm. This results in an effective flange focal distance of a_eff=111.5mm, the sum of the nominal flange focal distance a_n of 44mm and the depth of field v of 67.5mm for an interchangeable lens that can be flanged to the mounting surface A but is not shown here.

[0089] The at least approximately sharp image of LED 1 is created here in Fig. 2 in the image plane BE1 with a back focus s1' of approximately 200mm. This back focus s1' is calculated from the curved surface of the light-gathering lens 4 with a focal length f1 of 26mm and is calculated from the extrafocal focal distance z1 of the LED 1 from the front focal plane FE1 of the light-gathering lens 4, which in this case is z1=-3.4mm. The extension of the luminous image of the square LED 1 with a 6mm edge length of the luminous surface then has an edge length of approximately 46mm at a back focus s1' of approximately 200mm. In the position of the used entrance lens of a flanged interchangeable lens in focus at infinity, which is then approximately 110mm to 120mm away from the iris diaphragm 5a depending on the design, the lateral extent of the blurred image of the LED 1 is only approximately 25mm.This ensures, for example, that the rear lens of a Zhongyi Creator 135mm f / 2.8 Creator interchangeable lens, which is the entrance lens used here and has a diameter of approximately more than 30mm, is well illuminated but not overexposed. This results in a good light-technical match when such an interchangeable lens, as mentioned above, with a rear lens diameter of 30mm is flanged to the mounting surface A of bayonet 6a. With an effective flange focal distance of a_eff=111.5mm, the light field at the infinity position of the Zhongyi Creator 135mm f / 2.8 Creator interchangeable lens is 360mm away. The projection magnification is then betaP_strich 2:1. In the enlarged light field of 40mm diameter, which results from the diameter of the light field LF in the aperture plane E of D_F=20mm at the stated amount of the image scale, an illuminance of approximately 150 can be achieved.000 lux can be achieved in the projected light field when LED 1 is operated with an operating current of 2 A and a voltage of 11.6 V. The Zhongyi Creator 135mm f / 2.8 telephoto lens is set to the infinity position.

[0090] If an achromatic attachment lens with 3 diopters is attached to the Zhongyi Creator 135mm f / 2.8 telephoto lens with an effective flange focal distance of a_eff=111.5mm, the resulting image scale of the projection of betaP_strich is 1:1 and the illuminance in the projected light field of 20mm diameter reaches approximately 450,000 lux at a distance of 170mm. When using an achromatic attachment lens with 5 diopters on the Zhongyi Creator 135mm f / 2.8 telephoto lens, a projection scale of approximately betaP_strich=0.72:1 can be achieved and the illuminance in the projected light field of 14mm diameter reaches values ​​of well over 500,000 lux at a free distance of 120 mm from the lens mount with an operating current of 2 A and a voltage of 11.6 V on LED 1.

[0091] With this Zhongyi Creator 135mm f / 2.8 interchangeable lens and without the attachment of a conversion lens, an illumination intensity of approximately 270,000 lux can be achieved in a well-lit light field of 20 mm diameter at a betaP_strich ratio of approximately 1:1 and an effective flange focal distance of a_eff=179 mm, which can be adjusted using the bellows close-focusing device 8. The free working distance of the light field is approximately 235 mm from the front mount of the interchangeable lens. The electrical power at LED 1 is then also around 23 W. In the arrangement according to Fig. 2, the depth of LED 1, i.e., the change in focal distance z1, is quite uncritical, since with this arrangement, the cross-section of the beam containing the majority of the light energy in front of the rear lens of the Zhongyi Creator 135mm f / 2.8 interchangeable lens changes only slightly when LED 1 is moved in depth. However, the change in focal distance z1 here is only in the range of a few tenths of a millimeter.

[0092] Is mounted on the compact lamp assembly after Fig. 2 Now, if an older, widely available Revuenon-special 135mm f / 2.8 interchangeable lens (not shown here), which is focused at infinity, is flanged to the Canon EF bayonet using an adapter for the M42 thread, and the effective flange focal distance of a_eff=111.5mm is set again on the bellows close-up device 8, a blurred image of LED1 is created, at least approximately in the position of the rear lens of this interchangeable lens, which is used here as the entrance lens, but which is now somewhat overexposed. This is because the rear lens of this Revuenon-special 135mm f / 2.8 interchangeable lens only has a usable diameter of approximately 23mm.This rear lens, with its mechanical mount, then acts as the effective entrance pupil of the interchangeable lens, since the lens is not operated at the nominal flange focal distance a_n of 45.46 mm for the M42 lens mount, as specified by the lens manufacturer. The image of the built-in mechanical lens diaphragm, the aperture diaphragm of the camera lens, is the entrance pupil of this interchangeable lens. With an effective flange focal distance of a_eff=111.5 mm, the sharp image of the edge of the illuminated field diaphragm is obtained for this interchangeable lens, the Revuenon-special 135 mm f / 2.8 (not shown here), at a working distance of approximately 405 mm, and the magnitude of the projection scale is at least approximately betaP_strich = 2:1. This interchangeable lens Revuenon-special 135mm f / 2.8, not shown here, is used to sharply image the edge of the aperture blades 5b of the iris diaphragm 5a.Since this is a matter of illumination optics, imaging errors such as chromatic aberrations resulting from the use of this older Revuenon-special 135 / 2.8 interchangeable lens, which deviates significantly from the manufacturer's optical design, are still quite tolerable in most cases. This interchangeable lens is not designed for a magnification ratio of 2:1, as it is not a macro lens. The unusual use of the Revuenon-special 135mm f / 2.8 photo lens in the arrangement shown above allows for... Fig. 2, with an image scale betaP_strich of approximately 2:1, an illuminance of approximately 105,000 lux is achieved. The light field is quite evenly illuminated and has a diameter of 40 mm with an electrical power of 23 W at LED 1. However, the photometric adaptation of this interchangeable lens, the Revuenon-special 135 mm f / 2.8, is not quite optimal here, since the rear lens only has a usable diameter of approximately 23 mm.

[0093] With this Revuenon-special 135mm f / 2.8 interchangeable lens, an illumination intensity of approximately 160,000 lux can be achieved in a well-lit light field with a diameter of 20mm at a light field working distance of approximately 265mm, with a betaP_strich image scale of approximately 1:1. For this purpose, an effective flange focal distance of a_eff=179mm is set on the bellows close-focusing device 8. The electrical power at this time is also 23W at the LED.

[0094] The Fig. 3 shows an arrangement of a compact lamp assembly in the embodiment according to Fig. 2, in which the bellows close-focusing device 8 was replaced by a long bayonet tube 9 with a lens mount 6b for an interchangeable lens with an M42x1 screw thread. This is a widely used lens mount for interchangeable lenses. According to manufacturers, for example, the former Dresden-based company Pentacon and also Pentax, the flange focal distance for the M42x1 lens mount is 45.46 mm. A Revuenon-special 135 mm f / 2.8 camera lens can thus be directly screwed onto a compact light source assembly, and an effective flange focal distance of a_eff=179 mm can be set via the long bayonet tube 9 to achieve an image scale of 1:1. The free working distance of the light field from the mount of the aforementioned camera lens is then approximately 265 mm.But other, often still available old lenses with a lens mount M42x1 and especially with focal lengths of 100mm and up to 300mm as well as zoom lenses in this range are also well suited here - especially if they have a usable diameter of the rear lens, which represents the entrance lens here, of at least 23mm and even better 25mm in order to create a bright and sharply defined light field at close range.

[0095] The arrangement according to Fig. 4 for a compact light source assembly is also designed with a light-gathering lens 4 with a focal length f1=26mm. The set depth offset v here is 51mm, resulting in an effective flange focal distance a_eff of 95mm with the nominal flange focal distance a_n—with the value a_n=44mm specified by Canon for the EF lens mount. The white LED 1 of the type getian-gt-fc40 is arranged in front of the light-gathering lens 4 with a focal distance z1 of -1.3mm, i.e., extrafocal. The real image B1' of LED 1, which is not shown here, is then created at a focal length f1 of the light-gathering lens 4 of 26mm, at a distance of the back focal length s1' of 520mm from the lens vertex of the light-gathering lens 4. The real image point PL' is shown here as an image of the point PL on LED 1.A Canon 70mm-200mm f / 4.0 L zoom lens (not shown here) can be flanged onto this compact light source assembly using the bayonet mount 6a, which is designed as a Canon EF bayonet mount. This zoom lens is used for projection. It features a rear lens, which serves as an entrance lens for the light emerging from the free opening of the iris diaphragm 5a. The diameter of the rear lens of this zoom lens is at least 30mm, allowing the light passing through the iris diaphragm 5a to enter the lens unhindered. When setting a focal length of approximately 80mm on this zoom photo lens and adjusting it to the close distance, an illuminance of approximately 150,000 lux results in the depicted light field at a free working distance of 100mm, if the LED 1 here is operated with 23W electrical power.The light field is created here at 1.5x magnification of the luminous field with a field diameter of approximately 30mm when the iris diaphragm 5a has a free diameter of D_F=23mm.

[0096] If, however, the Canon 70mm-200mm f / 4.0 L zoom lens is set to a focal length of 200mm, the free working distance when set to close distance is approximately 515mm. With 23W of electrical power on LED 1, this results in an illuminance of approximately 100,000 lux in a light field with a diameter of 44mm, if the setting on the iris diaphragm 5a remains unchanged. The magnification betaP_strich is then 1.9:1. If this zoom lens is set to infinity and a zoom focal length of 200mm, the free working distance is even approximately one meter. Thus, with a compact illuminant assembly with the Fig. 4, in conjunction with a zoom camera lens, a very high degree of flexibility regarding the free working distance can be achieved with good use of the light energy. The free working distance can be adjusted from 100 mm to approximately one meter. With the older zoom camera lens of the type Soligor 85 mm - 208 mm f / 3.9, the compact light source assembly can be used in the training according to Fig. 4 comparable free distances as with the Canon 70mm-200mm f / 4.0 L zoom camera lens. However, the achievable illuminance in the light field is approximately 20% to 50% lower compared to the Canon 70mm-200mm f / 4.0 L zoom camera lens. This is also believed to be due to the significantly smaller rear lens of the Soligor 85mm-208mm f / 3.9 camera lens compared to the Canon 70mm-200mm f / 4.0 L camera lens, which has a diameter of only approximately 27mm and already somewhat limits the incoming light beam with an effective flange focal distance a_eff of 95mm. But the poorer coating of the lenses of this older Soligor 85mm-208mm f / 3.9 lens and age-related transmission losses, also due to dust inclusions and possible fungal infestation, reduce the achievable illuminance.

[0097] The Fig. 5 represents a compact lamp assembly particularly well-suited for photo lenses with a focal length of 85mm for 35mm full-format SLR cameras, which can be flanged to the compact lamp assembly as a projection lens. A long bayonet tube 9 houses the front-mounted bayonet 6a, which is designed as an F-bayonet for Nikon 35mm lenses. The long bayonet tube 9 is attached to the tube 7 by a screw connection (not shown in detail).

[0098] The nominal flange focal distance a_n here is a_n=46.5mm. This corresponds to the flange focal distance specified by Nikon for photo lenses with the F bayonet for 35mm full-format SLR cameras. A depth offset v preset on the compact lamp assembly with v=43.5mm results in an effective flange focal distance a_eff of a_eff=90mm, the sum of the nominal flange focal distance a_n and the depth offset v, for an interchangeable lens not shown here, which serves to sharply image the edge of the diaphragm blades 5b of the mechanical iris diaphragm 5a.

[0099] As can be experimentally demonstrated, with an effective flange focal distance of a_eff=90mm, a sharp image of the edge of a well-illuminated iris diaphragm 5a with the diaphragm blades 5b exposing a diameter of D_F=20mm can be achieved if a Zhongyi Creator 85mm f / 2.0 interchangeable lens with an F-bayonet and full aperture is flanged to the compact illuminant assembly. This interchangeable lens is set to the infinity position. This occurs at a focal distance z1, i.e., the depth of field of LED 1 to the light-gathering lens 4, of z1=-1.3mm. The focal distance z1 of z1=-1.3mm represents a slightly extrafocal position of LED 1 at the light-gathering lens 4, as in the arrangement according to Fig. 4. The free working distance from the lens mount to the object being photographed is then approximately 200mm, and the approximate magnification is betaP_strich=2:1. This allows – with the Zhongyi Creator 85mm f / 2 interchangeable lens fully open – to achieve an illuminance of at least 160,000 lux in a uniformly illuminated light field with a diameter of at least 40mm, with an electrical power of 23W at the LED. It can be seen that there are no significant changes in achievable illuminance and field illumination in the range of + / - 1.3mm around the focal point F1, i.e., from z1=-1.3mm to z1=+1.3mm.

[0100] If an achromatic 3-diopter attachment lens is attached to the Zhongyi Creator 85mm f / 2.0 Creator telephoto lens with an effective flange focal distance of a_eff=90mm, and this telephoto lens is in the infinity position, the resulting projection scale at a focal distance of z1=-1.3mm is betaP_strich=1.15:1. The illuminance in the projected light field with a diameter of 20mm then reaches approximately 410,000 lux at a free distance of 115mm from the lens mount.

[0101] In a first embodiment without figure with an effective flange focal distance a_eff of a_eff=90mm - and an otherwise identical structure as in the Fig. 5 - an extrafocal focal length distance z1 of z1=-6mm is now set. If a Zhongyi Creator 85mm f / 2.0 camera lens (not shown here) with a Nikon F bayonet and full aperture is flanged to the compact light source assembly, the sharp image of LED1 at this extrafocal focal length distance z1 of z1=-6mm is at least approximately in the range of the position of the rear lens of this interchangeable lens. This interchangeable lens is then set to the infinity position. The rear lens of this interchangeable lens has a diameter of approximately 28mm. This rear lens then acts at least approximately as the effective entrance pupil of this interchangeable lens, since it is not operated at the nominal flange focal distance a_n of 46.5mm as specified by the lens manufacturer.However, in this arrangement with the extrafocal focal length distance z1 of z1=-6mm, no higher illuminance is achieved compared to an arrangement according to . Fig. 5, where the focal distance z1 = -1.3 mm. There is even noticeable vignetting in the light field, so an extrafocal focal distance of z1 = -6 mm proves rather unsuitable here.

[0102] The Fig. 6 represents a compact illuminant assembly, especially for the use of photo lenses, i.e. interchangeable lenses for the 35mm full format for SLR cameras with a focal length between 50 and 85mm and, in exceptional cases, up to 135mm focal length, in order to be able to create an evenly illuminated, bright and sharply defined light field for macrophotography or moving image recordings. Here, too, as in Fig. 1, the LED 1 of the type getian-gt-fc40-5000k is used. This LED 1 with an edge length of approximately 6mm of the luminous surface is electrically operated in the same way as in Fig. 2. However, this LED 1 is positioned at a focal distance z1 of 4.8 mm intrafocally to the front focal plane FE1 of a light-gathering lens 4 with a focal length of 26 mm. The focal length fS1 of this lens 4 is 18 mm, which is calculated from the plane surface of the light-gathering lens 4. Here, too, it is - as in Fig. 2 - at the light-gathering lens 4, the aspherical, anti-reflective condenser lens designated ACL3026U-A, offered by Thorlabs. This light-gathering lens 4 acts as a collector, and downstream of this light-gathering lens 4 is a thinner luminous field lens 11, which acts as a condenser. This is the anti-reflective plano-convex lens LA1386-A from Thorlabs, which has a focal length of 75mm. The lens bellies of the two lenses face each other. For the luminous field lens 11, the image of the LED 1 represents a virtual light object in the finite range due to the aforementioned intrafocal position of the LED 1 at the light-gathering lens 4. This virtual image B1'v of the LED 1 is located at a distance approximately twice the focal length f2 of the thinner luminous field lens 11, and thus roughly approximately 150mm away from the light source.As a result, with regard to the imaging of the virtual image of LED 1 by means of the luminous field lens 11, there is at least approximately a 4f arrangement, which results in an approximately 1:1 imaging of this virtual image B1'v. Thus, the focal distance z2' is approximately equal to the focal length f2. This luminous field lens 11 concentrates the light from LED 1 downwards, creating a real image B1' of LED 1 in the image plane BE1 with an edge length of approximately 32.5 mm. This real image B1' is formed at least roughly approximately at a distance from the flat surface of the luminous field lens 11 that corresponds to the back focal length s2' from the flat surface of the luminous field lens 11 to the image plane BE1 of the image of LED1.This back focal length s2' only needs to be approximately adjusted to a value of 145mm by adjusting the depth of field from the focal distance z1, which is achieved by setting an intrafocal position of LED 1 with a focal distance z1 of 4.8mm. The back focal length fS2 of 70.1mm is a manufacturer's specification from Thorlabs for the plano-convex lens LA1386-A, which is used here as the luminous field lens 11. Increasing the back focal length s2', which represents the image distance, from 145mm by up to 35mm or reducing it by up to 25mm has only a very slight influence on the uniformity of the illuminance in the luminous field LF in the diaphragm plane E. The real image B1' is created from the virtual image B1'v of LED 1 in front of the luminous field lens 11, i.e., downstream of the luminous field lens 11, approximately with the magnitude of the image scale 1:1. The edge length of the approximately square image B2' is approximately 32.5mm.This arrangement creates uniform illumination in the passband of the iris diaphragm 5a, which is formed with diaphragm blades 5b and is opened to a maximum diameter of 18 mm here. This iris diaphragm 5a has a maximum diameter D_F of 23 mm. Its diaphragm blades 5b are arranged in the diaphragm plane E. However, the value for the focal point distance z1 of 4.8 mm can fluctuate slightly in order to create the real image of the LED 1 at a distance of approximately 145 mm from the belly of the luminous field lens 11. This is due to manufacturing variations in the light-gathering lens 4 and the luminous field lens 11, as well as small misalignments thereof and the design of the LED 1. Thus, distances between 120 mm and 180 mm from the luminous field lens 11 can result for the real image B1' of the LED1, without the illumination in the luminous field generally changing significantly.By means of the iris diaphragm 5a with the diaphragm blades 5b, which are mechanically adjustable in diameter D_F, the diameter of the light beam can be adjusted when an interchangeable camera lens is flanged onto the compact light source assembly for projecting the light field LF. The light passing through the iris diaphragm 5a in the free opening enters the short bayonet tube 10, which is equipped with a front-mounted bayonet 6a, and passes through this front-mounted bayonet 6a, which here is designed as an EF bayonet connection from Canon for SLR cameras for the 35mm format. This bayonet 6a is fixed to the short bayonet tube 10. The point PA lies on the optical axis OA at a distance of the nominal flange focal distance a_n of 44 mm from the mounting surface A of the bayonet 6a arranged here. This arranged bayonet 6a is attached to the short bayonet tube 10.This bayonet mount 6a is used to accommodate an older, widely produced EF interchangeable lens, the Canon EF 50mm f / 1.8 (not shown here), for a 35mm format SLR camera. Unlike more modern versions of the EF interchangeable lens, the Canon EF 50mm f / 1.8, this EF interchangeable lens has a manual focusing option. However, the option of manual focusing is a great advantage when a sharply defined light field is required for macro photography, or when a certain blurring of the edges of the light field is desired for design reasons. In such cases, manual focusing is a great advantage. The iris diaphragm 5a with the aperture plane E is positioned at a depth of 21.5 mm from point PA. This creates a significant depth offset v to the mounting surface A of the bayonet mount 6a, to which an interchangeable lens (not shown here) can be flanged.This results in an effective flange focal distance a_eff of a_eff=65.5mm for the interchangeable lens (not shown here), which is the sum of the nominal flange focal distance a_n of 44mm and the depth of field v of 21.5mm. The interchangeable lens (not shown here) is used to sharply image the edge of the aperture blades 5b of the iris diaphragm 5a, as a sharp edge is usually advantageous for lighting in macro photography. When focusing this older Canon EF 50mm f / 1.8 interchangeable lens for 35mm format at close range, a sharp image of the edge of the aperture blades 5b of the iris diaphragm 5a, which limit the light field, is produced at a short free distance from its lens mount, which in this case is around 110mm. The illuminance in the light field is then at least 220,000 lux with an electrical power of 23 W on LED 1 of type getian-gt-fc40-5000k.A free distance of 110mm from the lens mount to the sharply imaged light field is already a suitable value for object illumination in macro photography or video recordings in the macro range in many cases. The set diameter D_F of the iris diaphragm 5a is increased by 1.95 times and the amount of the image scale for the projection betaP_strich is therefore 1.95:1.Interchangeable lenses from other manufacturers with a 50mm or 55mm focal length - particularly those with an M42 screw mount - can also be used to advantage here using an adapter to the Canon EF bayonet. Photo lenses with a 50mm or 55mm focal length and a light intensity of 1:1.7 or 1:1.4 also bring a small increase in illuminance, but due to the dimensions of the optics in this case, this is significantly lower than would be expected from the ratio of the illuminances, since with interchangeable lenses with the highest aperture up to a light intensity of 1:1.2, the entrance pupils of the same are not fully illuminated by the incoming light beam according to the manufacturer's design.This arrangement is therefore particularly optimized for a compact lamp assembly for photo lenses with approximately 50mm to 60mm focal length and a light intensity of 1:1.8, since these lenses were produced in the millions worldwide and are still available in many cases and can also be purchased quite inexpensively from second-hand shop dealers.

[0103] The arrangement for a compact lamp assembly according to Fig. 6 is also well suited for the Tamron 60mm f / 2 macro lens, as it has a comparatively large rear lens element with a diameter of at least 26mm, which is used as the entrance lens. With a projection ratio of 2:1 (betaP_strich) this results in a free distance of 135mm between the light field and the lens mount. A very well-illuminated light field is achieved after the Tamron 60mm f / 2 macro lens for the intrafocal position of LED 1 with a focal distance z1 of 4.8mm, with the illuminance in the light field after the Tamron 60mm f / 2 macro lens being at least 240,000 lux. Illuminance values ​​in the center of the light field after the macro lens are even higher, by about 10%, for a focal distance z1 of +1.9mm. The Tamron 60mm F / 2 macro lens allows continuous manual focusing from 90mm to 200mm with an effective flange focal distance a_eff of 65.5mm.This allows the macro photographer a high degree of flexibility when illuminating a subject. The imaging situation with the compact lamp assembly in this . Fig. 6, which creates the real image of the LED 1 at an approximate distance of 145mm from the belly side of the luminous field lens 11, represents an optimum for lenses in the focal length range of 50mm to 85mm and possibly also for focal lengths of up to 135mm.

[0104] However, if the longer focal length, manual interchangeable lens Zhongyi Creator 85mm f / 2.0 is attached to the compact lamp assembly according to Fig. 6 is used and this interchangeable lens is focused on the close-up range, a significantly larger light field is created compared to an interchangeable lens with a 50mm or 60mm focal length. However, the illuminance in the light field after the interchangeable lens only reaches a value of approximately 130,000 lux, for example. The free distance to the light field is then even around 290mm. Thus, for an interchangeable lens with a significantly longer focal length than 50mm, a greater depth offset v than 21.5mm is required to achieve the same light field size as with an interchangeable lens with a 50mm or 60mm focal length, for example, a depth offset v of approximately 34mm.

[0105] If the Zhongyi Creator f / 2.0 camera lens with a focal length of 85mm, which is focused on close-up photography, is used here with an effective flange focal distance a_eff of 65.5mm, and an achromatic attachment lens with a refractive power of 5 diopters is attached to this interchangeable lens, the resulting illuminance in the light field is approximately 500,000 lux with an electrical power of 23W at LED 1 of type getian-gt-fc40-5000k. The free working distance to the light field is then around 115mm, and the magnification for the projection betaP_strich is approximately 1.26:1, which results in a slightly enlarged light field as an image of the transmission range of the iris diaphragm 5a.

[0106] If the Zhongyi Creator 135mm f / 2.8 camera lens, which is focused on close-up photography, is used here with an effective flange focal distance a_eff of 65.5mm, and an achromatic attachment lens with a refractive power of 5 diopters is attached to this interchangeable lens, the light field will also have an illuminance of at least 500,000 lux with an electrical power of 23W at LED 1 of the type getian-gt-fc40-5000k. The free working distance is around 155mm, and the magnitude of the image scale for the projection betaP _strich is then approximately 1:1, which results in a light field of the same size as the image of the transmission range of the iris diaphragm 5a, i.e. the light field LF.

[0107] The compact lamp assembly according to Fig. 7 corresponds to the Fig. 6 with the additional arrangement of an intermediate ring 13 of 12 mm width, resulting in an effective flange focal distance of a_eff=77.5 mm. This allows for a reduced light field for an interchangeable lens with a focal length of 85 mm or 135 mm compared to the arrangement according to Fig. 6 can be generated, which is advantageous, for example, for an interchangeable lens with a focal length of 85mm or 135mm, as the illuminance in the light field is then significantly increased. If a manual interchangeable lens, the Zhongyi Creator 85mm f / 2.0 with a Canon EF bayonet, set to a close-up focus of 0.85m, is flanged to the extension ring 13 with an effective flange focal distance of a_eff=78mm, the resulting image scale of betaP_strich is 2.0:1 at a free working distance of approximately 200mm. The achievable illuminance in the light field is then at least 220,000 lux. Reducing the focal distance z1 from 4.8mm to as little as 2.5mm results in only a slight variation in the achievable illuminance, and the illumination of the light field remains consistently good if the diameter D_F of the light field LF at the aperture plane E is a maximum of 20mm. The Zhongyi Creator 85mm f / 2.0, on the other hand, is focused on infinity, resulting in a free working distance of approximately 280mm, so that the focusing option on this interchangeable lens gives the user comparatively great flexibility in object illumination.

[0108] In a second embodiment without its own figure according to Fig. 7, a complete set of intermediate rings from Quenox is flanged to the bayonet 6a, resulting in a depth offset v of 84.5mm, which leads to a very small distance of the light field during projection.

[0109] The compact lamp assembly according to Fig. 8 largely corresponds to that of the Fig. 7, however, here a lens mount 6b for an interchangeable lens with an M42x1 screw thread is located on the short bayonet tube 10, and the effective flange focal distance a_eff is changed. The M42x1 thread is a lens mount for interchangeable lenses using a screw thread. This allows the interchangeable lenses with an M42x1 thread to be flanged on, which have been manufactured in the millions since the 1960s, particularly in Japan, and are still widely available among photographers or in secondhand shops. The nominal flange focal distance a_n for the M42x1 thread is a_n=45.46mm. The depth offset v created by the short bayonet tube 10 is calculated to be 20.04mm in order to achieve an effective flange focal distance a_eff of a_eff=65.5mm. The Auto Revuenon 55mm f / 1.7 camera lens can be advantageously mounted here in order to obtain a bright and evenly illuminated light field for macro photography.This has a diameter of the entrance lens mount of at least 23mm. If this camera lens is focused at close range, the effective flange focal distance a_eff of a_eff=65.5mm results in a free working distance of 130mm. The magnification for the projection betaP_strich is then around 2.2:1, and an illuminance of approximately at least 220,000 lux can be achieved in the light field if the focal distance in the arrangement shown in the figure is z1=4.8mm. This value can vary somewhat from setup to setup. If, on the other hand, the focal distance z1 is set to 2mm, an illuminance of approximately at least 240,000 lux can be achieved in the center of the projected light field, albeit with considerable vignetting in the projected light field. This can be advantageous for object lighting in certain shooting situations.However, the magnification for the projection betaP_strich remains unchanged at 2.2:1.

[0110] Other camera lenses with an M42x1 thread and, for example, a 50mm focal length can also be used advantageously. However, a camera lens with a 50mm focal length generally results in a somewhat shorter free working distance for the same image scale (betaP_strich) for projection compared to common camera lenses with a 55mm focal length. This, of course, also depends on the position of the principal planes of the interchangeable lens and the position of the front focal plane of the camera lens. When dimensioning according to Fig. 8 Common older camera lenses with a maximum aperture greater than f / 1.7, such as the older Auto Revuenon 55mm f / 1.4 camera lens, generally no longer offer any noticeable advantage in terms of achievable illuminance in the projected light field. This is the case here because the rear lens of the camera lens, which is also larger at a maximum aperture such as f / 1.4 (for example, 29mm in diameter), is no longer fully illuminated by a light beam approximately 25mm in diameter entering the rear lens.

[0111] The Fig. 9 shows a compact lamp assembly, the left part of which up to the iris diaphragm 5a is arranged according to Fig. 8. However, this compact illuminator assembly is designed for mounting the Rodagon 50mm f / 2.8 reproduction lens from Rodenstock. This reproduction lens, which is also interchangeable, has a flange size of 43.5mm according to the manufacturer's specifications. A depth offset v of v=34.5mm, which is set here with a bellows close-focusing device 8, results in an effective flange focal distance a_eff of a_eff=78mm. The attachment is made via the threaded connection 6c, which is located on the front of the bellows close-up lens 8 and is designed for a repro lens with an M39×1 / 26" thread. The attachment of the bellows close-up lens 8 to the tube 7 is not shown here. This results in a free distance from this repro lens to the light field of approximately 120 mm, and the illuminance in the light field exceeds 100,000 lux with an electrical power of 23 W at the LED 1 of the type getian-gt-fc40.This results in a 1.7-fold magnification of the light field compared to the diameter D_F of the light field LF at the aperture plane E. The use of a bellows close-focusing device 8 is particularly advantageous when the interchangeable lens—such as the repro lens here—has no focusing capability of its own and a wide range of distances to the light field is desired.

[0112] In the Fig. Figure 10 shows an arrangement for a compact light source assembly for flange-mounting camera lenses with a lens mount 6a for an interchangeable lens via a bayonet. This lens mount 6a represents a Nikon F bayonet, which has a flange focal distance a_n of 46.5mm according to the manufacturer's specifications. The effective flange focal distance a_eff=78mm is determined by the depth offset v of v=31.5mm, which is determined by the setting of the bellows close-focusing device 7. The attachment of the bellows close-focusing device 8 to the tube 7 is not shown here. If a Zhongyi Creator 135mm f / 2.8 interchangeable lens is set to its close-up range of 1.5m and flange-mounted to the Nikon F bayonet, an effective flange focal distance a_eff of a_eff=78mm results in a free distance from this interchangeable lens to the light field of approximately 490mm.For a focal distance z1 setting of 4.8 mm, uniform field illumination is achieved in a light field with a diameter of 60 mm, provided the iris diaphragm has a diameter D_F of the light field LF in the diaphragm plane E of 20 mm. The magnification ratio betaP_strich is approximately 3:1. An illuminance of approximately 100,000 lux can be achieved in the light field with an electrical power of 23 W at the LED 1 of the type getian-gt-fc40. However, the bellows close focusing device 8 also allows the setting of a much larger flange focal distance a_eff, for example, a_eff=180 mm. This results in a free working distance to the projected light field of 235 mm. With the Zhongyi Creator 135mm f / 2.8 interchangeable lens, a betaP_strich image scale of 1.05:1 can be achieved, i.e. a comparatively small and bright light field, and the illuminance in the light field is approximately 240.000 lux is possible with an electrical power of 23 W on the getian-gt-fc40 LED 1. With a flanged interchangeable lens with a focal length of 135 mm, the quality of the illumination of the light field fluctuates significantly less depending on the focal distance setting z1 than with lenses with a focal length of 50 mm.

[0113] The Fig. 11, which is not to scale, has a light-gathering lens 4 with a focal length of f1=26mm and a luminous field lens 11 with a focal length of f2=75mm in the arrangement for a compact lamp assembly. This Fig. 11 shows an arrangement for a compact light source assembly for flange-mounting an interchangeable lens from the photographic field, which has a bayonet, to the lens mount 6a. This lens mount 6a here represents a Canon EF bayonet, which has a flange focal distance a_n of 44mm according to the manufacturer's specifications. This results in an effective flange focal distance a_eff with a depth offset v of 42mm: a_eff=86mm. The set focal distance z1 for a focal length f2 of 75mm is approximately z1=4.8mm. This focal distance z1 of 4.8mm creates an enlarged virtual image B1'v of the LED 1, which serves as a light object for the downstream luminous field lens 11 and has an edge length of 32.5mm. This virtual image B1'v is imaged by the luminous field lens 11 approximately with the magnitude of the image scale of 1:1.Thus, with a back focus s2' of approximately 145mm, calculated from the plane surface of the luminous field lens 11, a real image B1' of the LED 1 in the image plane BE1 with an edge length of approximately 32.5mm is created. The beam extension in the area of ​​the lens mount 6a for an interchangeable lens with a bayonet is thus significantly smaller than the edge length of 32.5mm. With this design of a compact light source assembly, attaching a Canon 70mm-200mm f / 4.0 L telephoto zoom interchangeable lens to the lens mount 6a is very advantageous for generating a sharply imaged light field at an adjustable free distance of 100mm to 600mm. The diameter of the rear lens of this telephoto zoom interchangeable lens, which is used here as the entrance lens, is at least 30mm, so the rear lens is not outshone by the incoming light beam, which represents a good lighting adaptation.When setting different zoom focal lengths on the aforementioned telephoto zoom interchangeable lens, the magnification of the light field changes comparatively little, but the position of the sharply imaged light field, and thus the free distance in depth, changes considerably. For example, with a zoom focal length of 70mm, when the aforementioned interchangeable lens is set at close range, the free distance from the telephoto zoom interchangeable lens to the light field is approximately 100mm—which can be considered the usable working distance for macro photography using a camera. This results in an illuminance of at least 140,000 lux in the light field with an magnification of 1.65:1 and an electrical power of 23W at LED 1 of the type getian-gt-fc40. The diameter of the light field projected by the aforementioned telephoto zoom interchangeable lens is 38mm when the iris diaphragm 5a is set to a diameter of 23mm.If, however, a zoom focal length of 200mm is set, the close-up focus of the aforementioned interchangeable lens results in a free distance to the light field of approximately 600mm and an illuminance of at least 80,000 lux with an image scale of 2.2:1. The diameter of the light field is 51mm if the iris diaphragm 5a remains set to a diameter of 23mm. This is also the case with an electrical power of 23W at the LED 1 of the aforementioned type. In the depth range from 100mm to 600mm, with an effective flange focal distance of a_eff=86mm, a sharply imaged light field can be set at any depth position across the zoom focal length of this telephoto zoom interchangeable lens, without the illuminance and image scale changing significantly.This allows the photographer who wants to take a macro photograph of a small object, which may be located in the wild, for example, and thus at various distances from their camera, to work effectively. This small change in image scale over such a large free distance is not achievable with a conventional macro lens, for example, one with a focal length in the range of 60mm to 105mm. However, when using a conventional interchangeable telephoto zoom lens – with a focal length range of 70mm to 200mm and a maximum aperture of 1:4 – the lower illuminance in the projected light field must be accepted compared to a normal lens or macro lens with a higher maximum aperture. And this despite the diameter of the rear lens, which serves as the entrance lens, of this interchangeable telephoto zoom lens being at least 30mm.This is where the relatively low aperture of 1:4 of the telephoto zoom interchangeable lens becomes noticeable compared to a normal lens with, for example, a aperture of 1:1.8 or a macro lens with a aperture of 1:2 or 1:2.8.

[0114] In the arrangement according to Fig. 12, which is not to scale, a flange focal distance a_n of 46.5 mm is realized in the arrangement for a compact lamp assembly, which is the flange focal distance of lenses with a Nikon F bayonet. Thus, with a depth offset v of 53.5 mm, the effective flange focal distance a_eff is a_eff=100 mm. The arrangement according to Fig. 12 further comprises a light-gathering lens 4 with a focal length f1=26mm and a luminous field lens 11 with a focal length of f2=100mm. The focal distance z1 of the light-gathering lens 4 is set to approximately 3.3mm. The position of the LED1 is therefore intrafocal. The real image B1' is the image of the virtual image B1'v. The virtual image B1'v, which has an edge length of approximately 47.3mm, is imaged by the luminous field lens 11 with an image scale of approximately 1:1. The real image B1' of the LED1 is thus created at a back focal length s2' of approximately 200mm and has an edge length of approximately 47mm.

[0115] As already described, there is an effective flange focal distance of a_eff=100mm, without going into the details of its technical implementation here. Lens mount 6a is designed for an interchangeable lens with a Nikon F bayonet. If a Zhongyi Creator 85mm f / 2.0 interchangeable lens with a Nikon F bayonet is flanged to this lens mount 6a and this interchangeable lens is focused to infinity, the free working distance to the sharply imaged light field is 160mm. This results in an image scale (betaP_strich) of 1.63:1 and a luminous intensity at the center of the light field of approximately 280,000 lux. If, on the other hand, the Zhongyi Creator 85mm f / 2.0 interchangeable lens is focused at close range, the free working distance to the sharply imaged light field is approximately 140mm and the light intensity in the center of the light field is approximately 340,000 lux.

[0116] But even with a bright-field lens 11 with a focal length of f2=100mm, attaching a Canon 70mm-200mm f / 4.0 L telephoto zoom interchangeable lens to lens mount 6a is very advantageous for macro photographers, creating a sharply focused light field. This light field can then be adjusted at any distance from the interchangeable telephoto zoom lens, from 100mm to 600mm, by varying the zoom focal length, opening up a wide range of creative possibilities for macro photography.

[0117] In Fig. 13, which is not to scale, a flange focal distance a_n of 17.7 mm is realized in the arrangement for a compact illuminant assembly, which is the flange focal distance of interchangeable lenses with a Fujifilm X bayonet. Thus, with a depth offset v of 30 mm, the effective flange focal distance a_eff is a_eff=47.7 mm. In the arrangement according to Fig. 13 also features the luminous field lens 11 with a focal length f2 of only 50mm, manufactured by Thorlabs, type LA1385-A. This short focal length f2 of 50mm is advantageous for interchangeable lenses when the diameter of the entrance lens used here—the "rear lens" of the camera lens in photographic terminology—is only approximately 15mm to 20mm or even smaller, and these interchangeable lenses have a comparatively short focal length. This is because the cross-section of the incoming light beam is reduced by the comparatively short focal length f2 of 50mm compared to the use of a luminous field lens with a longer focal length. Zoom lenses in the weak telephoto range, as well as lenses with a maximum aperture of f / 2.8 and smaller in the focal length range of 35mm to 60mm, have a smaller rear lens. The focal distance z1 from the light-gathering lens 4 is set to approximately 6.5mm here.The position of LED1 is therefore intrafocal. The real image B1' is the image of the virtual image B1'v, which has an edge length of approximately 24 mm. The virtual image B1'v is imaged by the luminous field lens 11 with an image scale of 1:1. The real image B1' of LED 1 is thus created at a back focus distance s2' of approximately 93 mm and has an edge length of approximately 24 mm.

[0118] In this case, with a luminous field lens 11 with a focal length of 50mm, the use of a 135mm camera lens with a maximum aperture of f / 2.8 is no longer necessarily recommended if a comparatively small light field is to be projected. This could result in a mismatch between the size of the entrance light beam for imaging LED 1 and the diameter of the entrance lens of this camera lens.

[0119] The comparatively short focal length interchangeable lenses from the Chinese manufacturer 7Artisans can also be used advantageously here, for example, the 55mm f / 1.4 and 50mm f / 1.8 interchangeable lenses, the latter of which has a rear lens diameter of approximately only 17mm, as well as the 60mm f / 2.8 macro lens, both designed for the APS-C format. These interchangeable lenses are designed with the Fujifilm X-type bayonet and thus each have a nominal flange focal distance a_n of 17.7mm.

[0120] For the interchangeable lens from the Chinese manufacturer 7Artisans 55mm f / 1.4 for the APS-C format, which has a rear lens with a diameter of approximately 20mm and is used here as the entrance lens, set to the close-up distance and aperture of 1.4, a remarkably high illuminance of at least 400,000 lux is achieved in the center of the light field at a free distance of 100mm from the lens mount to the projected light field (not shown here). This illuminance decreases by only a few percent toward the edge of the light field when the field diaphragm is set to a diameter D_F of 16mm. The magnification is then approximately 1.5:1, resulting in a light field projected by this interchangeable lens (not shown here) with a diameter of approximately 24mm.The current at the aforementioned LED 1 of type getian-gt-fc40 is approximately 2A and the electrical voltage 11.6V. When this interchangeable lens is set to the infinity position, a free distance of 130mm from the lens mount to the projected light field (not shown here) results in an illuminance of at least 300,000Lux in the center of the light field. The image scale is then approximately 2:1. With this interchangeable lens, the field diaphragm can even be set to a diameter D_F of 23mm without there being a noticeable drop in illuminance towards the edge of the light field. This interchangeable lens from the Chinese manufacturer 7 Artisans, with the data 55mm f / 1.4 for the APS-C format, is particularly well suited for use on the camera shown here. Fig. 13. However, even with the inexpensive interchangeable lens from the Chinese manufacturer 7Artisans with the specifications 50mm f / 1.8 for the APS-C format, which has a rear lens with a diameter of approximately only 17mm, an illuminance of at least 200,000 lux in the center of the light field can be achieved at close focus with a free working distance of 130mm and a betaP_strich magnification of 1.5. This is perfectly sufficient for many lighting situations in macro photography.

[0121] In the Fig. 14, in the arrangement for a compact light source assembly, the lens mount 6d is a C-mount threaded mount according to the ANSI / SMPTE 76-1996 1-32 UN 2A standard, and the luminous field lens 11 is also designed with a focal length f2 of 50mm. This is advantageous for video lenses when the diameter of the entrance lens—here, the rear lens of the video lens—is only about 15mm or even smaller. The depth offset v of 8.8mm, with the flange focal distance of 17.526mm according to a C-mount connection, results in an effective flange focal distance a_eff of approximately 26.3mm.

[0122] Here too, as in the arrangement according to Fig. 13 - the focal distance z1 from the light-gathering lens 4 is set to approximately 6.5 mm. The real image B1' is the image of the virtual image B1'v, which then also has an approximately 24 mm edge length and is imaged by the luminous field lens 11 with an image scale of approximately 1:1. The real image B1' of the LED1 is thus created at a back focus distance s2' of approximately 93 mm and with an approximately 24 mm edge length.

[0123] Is used as a projection lens for the iris diaphragm 5a on the arrangement for a compact lamp assembly according to Fig. 14 For example, if the inexpensive video lens from Fujian with the specifications 35mm and f / 1.6 and a rear lens diameter of approximately 15mm as well as a C-mount connection is attached as an interchangeable lens, the following results: In the close-up position, with a free distance of approximately 120mm, the illuminance is at least 150,000 lux in the center of the light field, and this with an image scale betaP_strich of approximately 3:1. The projected light field has a diameter of 48mm, since the diameter D_F of the light field is set to 16mm. In the infinity position, with a free distance of 160mm, the illuminance is then at least 100,000 lux in the center of the light field, and this with an image scale of approximately 4:1. The projected light field has a diameter of 64mm because the diameter D_F of the light field is set to 16mm.Thus, this inexpensive video lens from Fujian, with specifications of 35mm and f / 1.6, is still quite suitable for macro lighting despite its comparatively short focal length of only 35mm. However, a cost-effective video lens with specifications of 50mm and f / 1.4 can also be used to project the light field, which allows for larger projection distances.

[0124] In a third embodiment without separate figure drawing, but based on the arrangement according to Fig. 14, a C-mount threaded connection with a nominal flange focal distance of 17.526 mm is also formed on the compact light source assembly. The used light field lens 11 from Thorlabs also has a focal length f2 of 50 mm, while the light-gathering lens has a focal length f1 of 26 mm. However, a set depth offset v of 16.7 mm, which is added to the nominal flange focal distance of 17.526 mm, results in an effective flange focal distance a_eff of approximately a_eff=34.2 mm. If a C-mount video lens is now attached to the compact light source assembly, which represents a small, inexpensive TV interchangeable lens with the specifications 50 mm f / 1.4, a light field with an image scale betaP_strich of approximately 2:1 can be projected at a free distance of 125 mm.The diameter of the well-lit and sharply defined light field is then 28 mm, and the achievable light intensity in the center of the light field is at least 200,000 lux. However, the rear lens of the 50 mm f / 1.4 TV interchangeable lens, which is used as the entrance lens here, is slightly overexposed, so the light-technical adjustment is not entirely optimal.

[0125] In a fourth embodiment without separate figure drawing, but based on the arrangement according to Fig. 14, the lens connection is designed as a CS-mount threaded connection with a flange focal distance of 12.5 mm, allowing lenses with a focal length of, for example, only 16 mm to be used for close-up illumination with a free working distance of only 40 mm. In a fifth exemplary embodiment without a separate figure, a luminous field lens 11 is used in the compact illuminant assembly, which has a focal length f2 of 40 mm, while the light-gathering lens used has a focal length f1 of 26 mm. The focal distance z1 is approximately 9 mm. A set depth offset v of 16.7 mm, which is added to the nominal flange focal distance of 17.526 mm, leads here, as in the fourth exemplary embodiment without a separate figure, to an effective flange focal distance a_eff of approximately a_eff = 34.2 mm.If a 50mm f / 1.4 TV interchangeable lens is attached to the compact light source assembly, the rear lens of the 50mm f / 1.4 TV interchangeable lens, which is used here as the entrance lens, is not overexposed, so that the lighting adaptation is optimal.

[0126] In the Fig. Figure 15 illustrates how the compact illuminating assembly can also be controlled wirelessly by the photographer using a radio wave receiver section 15 and a radio wave transmitter section 16, the latter being part of a smartphone with a touch-sensitive display 17. Furthermore, the illuminating assembly also includes a motorized field diaphragm 5c with an electric motor 18 for operating the diaphragm blades 5b, which are thus electrically operable. The smartphone is represented here only by its touch-sensitive display 17. This involves setting the operating current for LED 1 and setting the diameter D_F of the diaphragm elements of the motorized field diaphragm 5c. The operation of the lighting assembly and thus the adjustment of the aforementioned parameters is carried out via the touch-sensitive display 17.Two slide controls are symbolically displayed on the touch-sensitive display 17. These are used to control the operating current of LED 1 and the average diameter D_F of the aperture formed by the diaphragm blades 5b of the motorized field diaphragm 5c.

[0127] In the Fig. 16 shows a compact illuminating assembly incorporating a remotely controllable liquid diaphragm 5d, which is operated with the liquid 19. This liquid diaphragm 5d can also be controlled wirelessly by the photographer using a radio wave receiver part 15a and a radio wave transmitter part 16, the latter being part of a smartphone with a touch-sensitive display 17.

[0128] In the Fig.17 shows a compact illuminating assembly in which an electrically controllable liquid lens 11a is integrated, which is arranged downstream of the iris diaphragm 5a. The liquid lens 11a is integrated into the lens mount 6. The achievable refractive power of this liquid lens 11a is between 7 diopters and 10 diopters. Thus, by varying the refractive power of this liquid lens 11a, the distance of the projected light field can be significantly changed if an interchangeable lens for projecting it is attached to the compact illuminating assembly and the liquid lens 11a is thus arranged directly in front of the entrance lens of the interchangeable lens (not shown here). The entrance lens of this interchangeable lens represents its rear lens during its standard use, since this interchangeable lens is used for projection here.This liquid lens 11a can also be controlled wirelessly by the photographer using a radio wave receiver part 15b and a radio wave transmitter part 16, the latter being part of a smartphone with a touch-sensitive display 17. List of reference symbols and explanations as well as definitions 1 LED 2 current controllers 3 Accumulator for electrical supply of LED 1 4 light-collecting lens 5 field diaphragm 5a mechanical iris diaphragm as a special design of the field diaphragm 5 5b Aperture blades 5c electrically controlled, motorized iris diaphragm as a special design of the field diaphragm 5 5d electrically controllable liquid diaphragm as a special design of the luminous field diaphragm 5 6 Lens connection in the design for a camera (female piece) for the flange connection of an interchangeable lens with a support surface A This can be a bayonet, a plug-in or a threaded connection. 6a Lens mount for an interchangeable lens with a bayonet. The bayonet can be mounted on a body, a tube, an extension ring, or a bellows close-focusing device. In any case, this bayonet is the counterpart to the bayonet of an interchangeable lens and corresponds to a camera-side bayonet. 6b Lens mount for an interchangeable lens with a screw thread M42x1 This lens mount corresponds to a camera-side mount. 6c Lens mount for an interchangeable lens with a screw thread M39×1 / 26". This lens mount corresponds to a camera-side mount. 6d Lens mount for an interchangeable lens with a screw thread for a C-mount lens with an outer diameter of one inch and a thread pitch of 1 / 32 inch. This lens mount corresponds to a camera-side mount. 7 tube 8 Bellows close-up device 9 long bayonet tube 10 short bayonet tube 11 Light field lens, which is arranged in front of the light field LF 11a electrically controllable liquid lens 12 Condenser group 13 intermediate ring 14 group of intermediate rings 15 Radio wave receiver part for remote control of the motorized iris diaphragm 5c and the current controller 2 15a Radio wave receiver part for remote control of the electrically controllable liquid diaphragm 5d and the current controller 2 15b Radio wave receiver part for remote control of the electrically controllable liquid lens 11a and the current controller 2 16 Radio wave transmitter 17 touch-sensitive display 17 of a mobile phone 18 electric motor for operating the aperture blades 5b 19 Liquid in the electrically controllable liquid orifice 5d A Support surface for an interchangeable lens The lens shoulder of a commercially available interchangeable lens is flanged to the support surface A for projecting the light field LF. AZ support surface for an interchangeable lens on an intermediate ring 13 d1 Distance of the aperture plane E from the plane surface of the light-collecting lens 4 d2 Distance of the aperture plane E from the plane surface of the luminous field lens 11 a_eff effective flange focal distance The effective flange focal distance a_eff is calculated upwards from the mounting surface of the lens mount 6, 6a, 6b, 6c, 6d to the aperture plane E. With an extension ring, the nominal flange focal distance a_n is calculated from the mounting surface AZ. a_n is the nominal flange focal distance of an interchangeable lens, as specified by the lens manufacturer. The nominal flange focal distance a_n is always calculated upwards from the mounting surface A of the lens mount 6, 6a, 6b, 6c, 6d to point PA. For an extension ring, the nominal flange focal distance a_n is calculated from the mounting surface AZ. b Width of the intermediate ring 13 B1' real image of LED 1 B1'v virtual image of LED 1 BE1 Image plane in which a real image B1' of LED 1 is created betaF_strich Amount of the image scale of an interchangeable lens assuming the direction of light to the sensor chip or film plane according to the manufacturer's specifications for an interchangeable lens The amount of the maximum image scale betaF_strich of a normal interchangeable lens for photography according to the lens manufacturer's specifications is always significantly smaller than 1:1, for example 1:4 to 1:9. betaP_strich Magnitude of an interchangeable lens for projecting the luminous field LF. The magnitude of the betaP_strich represents the inverse of the magnitude of the betaP_strich specified by the manufacturers of the interchangeable lenses for film or sensor imaging. The maximum magnification of a standard interchangeable lens, which is used here for projection, is significantly greater than 1:1, for example, 3:1. d1 Distance of the plane surface of the light-collecting lens 4 from the plane E d2 Distance of the plane surface of the luminous field lens 11 from the plane E D_F Diameter of the luminous field LF in the aperture plane E E Aperture plane, which is represented by the aperture blades 5b or the electrically controllable liquid aperture 5d f1 Focal length of the light-gathering lens 4 F1 front focal point of the light-gathering lens 4 f2 focal length of the field lens 11 FE1 front focal plane FE1 of the light-gathering lens 4 fS1 focal length of the light-gathering lens 4 LF luminous field in the aperture plane E OA optical axis P Center of the aperture plane E on the optical axis OA PA Point on the optical axis OA at a distance from the support surface A or the support surface AZ in the size of the nominal flange focal distance a_n of a lens mount 6, 6a, 6b or 6c PL Point on the illuminated front side of LED 1, which lies on the optical axis OA PL' real image point of the point PL This can be done by imaging using the light-collecting lens 4 or by imaging using both the light-collecting lens 4 and the luminous field lens 11 PL'v virtual image point of the point PL solely by imaging by means of the light-collecting lens 4 s1' focal length from the curved surface of the light-collecting lens 4 to the image plane BE1 of the image of the LED1 s2' back focus distance from the plane surface of the luminous field lens 11 to the image plane BE1 of the image of the LED1 v Depth offset, always related to a lens connection 6, 6a, 6b, 6c or 6d in the design for a camera (female piece) The depth offset v represents the difference between the effective flange focal distance a_eff for an interchangeable lens flanged to the mounting surface A or AZ for imaging the light field LF and the nominal flange focal distance a_n of the lens connection 6, 6a, 6b, 6c or 6d in the design for a camera. z1 signed focal distance of the LED 1 from the front focal plane FE1 of the light-collecting lens 4 This signed focal distance z1 is - according to the frequently used sign rule - in geometric optics positive for an intrafocal position of the LED 1 and negative for an extrafocal position of the LED 1.

Claims

[1] Compact lamp assembly for a lighting arrangement, especially for macro photography or for close-up motion picture recordings with a light source, with at least one light-collecting lens arranged downstream of the light source, with at least one field diaphragm arranged downstream of the light-collecting lens, characterized by that the light source either by means of a single LED (1), as a group of individual LEDs, as an LED array, or is designed as an LED (1) with a downstream, digitally controllable, spatial light modulator and the compact illuminant assembly is designed with a flat support surface (A, AZ) as a component of a lens mount (6, 6a, 6b, 6c, 6d) or an intermediate ring (13) for a commercially available interchangeable lens, and the lens mount (6, 6a, 6b, 6c, 6d) has a generally known nominal flange focal distance (a_n) according to the specification of a commercially active lens manufacturer for this lens mount (6, 6a, 6b, 6c, 6d) and the support surface (A, AZ) is spaced from the diaphragm plane (E) of the luminous field diaphragm (5) by an effective flange focal distance (a_eff) downwards by mechanical means and this effective flange focal distance (a_eff) results from the addition of the nominal flange focal distance (a_n) and a predetermined depth offset (v) and the depth offset (v) is greater than or equal to the 0.2 times and less than or equal to 5 times the nominal flange focal distance (a_n) as specified by a commercially active lens manufacturer and the focal length (f1) of the light-gathering lens (4) is less than or equal to twice the nominal flange focal distance (a_n) of this lens mount (6, 6a, 6b, 6c, 6d) specified by the commercially active lens manufacturer and greater than or equal to one third of the nominal flange focal distance (a_n) of this lens mount (6, 6a, 6b, 6c, 6d) specified by the commercially active lens manufacturer and a luminous field lens (11) with the focal length (f2) is arranged downstream of the light-collecting lens (4) and the luminous field lens (11) is arranged upstream of the luminous field (LF). [2] Compact lamp assembly for a lighting arrangement, according to claim 1, characterized in that in the case of a lens mount (6, 6a, 6b, 6c, 6d) of the type for a mirrorless camera, the depth offset (v) on the compact lamp assembly is specified by a predetermined value which is positive and greater than or equal to 0.3 times the nominal flange focal distance (a_n) according to the manufacturer's specifications. [3] Compact illuminant assembly for a lighting arrangement according to claim 1, characterized in that in a lens mount (6, 6a, 6b, 6c, 6d) of the type for a camera with a built-in oscillating mirror or a semi-transparent mirror, the focal length (f1) of the light-collecting lens (4) is less than or equal to 1.3 times the nominal flange focal distance (a_n) of this lens mount (6, 6a, 6b, 6c, 6d) specified by the manufacturer. [4] Compact illuminant assembly for a lighting arrangement according to claim 1 and one of claims 2 or 3, characterized in that the focal length (f1) of the light-collecting lens (4) is between 10 mm and 40 mm and its numerical aperture is between 0.4 and 0.

9. [5] Compact illuminant assembly for a lighting arrangement according to 1 and claim 4, characterized in that the focal length (f1) of the light-collecting lens (4) is between 18 mm and 28 mm. [6] Compact luminous element assembly according to claim 1 and claims 4 and 5, characterized in that the light-collecting lens (4) is designed with a focal length (f1) of 26 mm. [7] Compact illuminant assembly according to claims 1, 3 and one of claims 4 to 6, characterized in that in the case of a lens connection (6, 6a, 6b, 6c, 6d) on the illuminant assembly - in the design for a camera - the depth offset (v) is predetermined with a positive value between v=8mm and v=150mm. [8] Compact illuminant assembly for a lighting arrangement according to claim 7, characterized in that in the case of a lens connection (6, 6a, 6b, 6c, 6d) on the illuminant assembly - in the design for a camera - the depth offset (v) is predetermined by a positive value of v=21.5 mm. [9] Compact illuminant assembly for a lighting arrangement according to claim 1 and at least one of claims 2 to 8, characterized in that a current controller (2) is assigned to an LED (1) for electrical operation, to which a battery (3) is connected. [10] Compact luminous element assembly for a lighting arrangement according to claim 9, characterized in that the LED (1) is operated with an electrical voltage between 11.5V and 12.5V. [11] Compact illuminant assembly for a lighting arrangement according to claim 1 and at least one of claims 2 to 10, characterized in that the luminous field diaphragm (5) is designed as a mechanical iris diaphragm (5a) or as a diaphragm with sliding diaphragm blades. [12] Compact illuminant assembly for a lighting arrangement according to claim 1 and at least one of claims 2 to 10, characterized in that the luminous field diaphragm (5) is formed with a digitally controllable, spatial light modulator in the diaphragm plane (E). [13] Compact illuminant assembly for a lighting arrangement according to claim 1 and at least one of claims 2 to 10, characterized in that the luminous field diaphragm (5) is designed as an electrically controllable liquid diaphragm (5d). [14] Compact illuminant assembly for a lighting arrangement according to claim 1 and at least one of claims 2 to 13, characterized in that the lens connection (6a) in the compact illuminant assembly is designed with a bayonet for a commercially available or formerly commercially available interchangeable lens for the 35mm or APS-C format. [15] Compact illuminant assembly for a lighting arrangement according to claim 1 and at least one of claims 2 to 13, characterized in that the lens connection (6b, 6c) on the compact illuminant assembly is designed for a commercially available or formerly commercially available interchangeable lens with a thread (6b, 6c). [16] Compact illuminant assembly for a lighting arrangement according to claim 1 and at least one of claims 2 to 14, characterized in that at least one fixed intermediate ring (13) or a variable intermediate ring with a lens connection (6a) for an interchangeable lens with bayonet is arranged on the compact illuminant assembly. [17] Compact illuminant assembly for a lighting arrangement according to claim 1 and at least one of claims 2 to 13 and 15, characterized in that at least one fixed or one variable intermediate ring with a lens connection (6b, 6c) for an interchangeable lens with a thread is arranged on the compact illuminant assembly. [18] Compact illuminant assembly for a lighting arrangement according to claim 1 and at least one of claims 2 to 14, characterized in that a bellows close-up device (8) with a lens connection (6, 6a, 6b, 6c, 6d) for an interchangeable lens of the type for a camera is arranged. [19] Compact illuminant assembly for a lighting arrangement according to claim 1 and at least one of claims 2 to 18, characterized in that an electrically controllable liquid lens (11a) is assigned to the lens connection (6, 6a, 6b, 6c, 6d). [20] Compact illuminant assembly for a lighting arrangement according to at least one of claims 1 and 19, characterized in that that the LED (1) is arranged intrafocally in front of the light-collecting lens (4) and for the focal distance (z1) to the light-collecting lens (4) the two relationships (z1) less than or equal to 0.7*f12 / f2 and (z1) greater than or equal to 0.3*f12 / f2 are maintained. [21] Compact lamp assembly for a lighting arrangement according to claim 20, characterized in that that the relationship (z1) equals 0.5*f12 / f2 is complied with. [22] Compact illuminant assembly for a lighting arrangement according to claim 1, characterized in that the luminous field lens (11) is designed with a focal length (f2) less than or equal to 150 mm and greater than or equal to 18 mm. [23] Compact illuminant assembly for a lighting arrangement according to claim 22, characterized in that the luminous field lens (11) is designed with a focal length (f2) of 75 mm. [24] Compact illuminant assembly for a lighting arrangement according to claim 22, characterized in that the luminous field lens (11) is designed with a focal length (f2) of 50 mm. [25] Compact illuminant assembly for a lighting arrangement according to claim 22, characterized in that the luminous field lens (11) is designed with a focal length (f2) of 35 mm. [26] Compact illuminant assembly for a lighting arrangement according to claim 22, characterized in that the luminous field lens (11) is designed with a focal length (f2) of 30 mm. [27] Compact illuminant assembly for a lighting arrangement according to claim 1 and at least one of claims 2 to 26, characterized in that electrical means (15) are arranged for remote control of a motorized iris diaphragm (5c).

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