Compact lamp assembly for a lighting arrangement, especially for macro photography or for close-up motion picture recordings

Abstract

An arrangement for a compact illuminating element assembly comprising an LED (1), at least one light-collecting lens (4) arranged downstream of the LED (1), and at least one luminous field diaphragm (5, 5a, 5b, 5c, 5d) arranged downstream of the light-collecting lens (4) and having a diaphragm plane (E) is proposed. The compact illuminating element 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 support surface (A, AZ) is spaced downstream of the diaphragm plane (E) of the luminous 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 as specified by a commercial lens manufacturer for the lens mount (6, 6a, 6b, 6c, 6d) and a predetermined depth offset v.This depth shift v represents the deviation from the nominal flange focal distance of the interchangeable lens. The depth shift 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 shift v enables the predetermined reduction of the minimum focusing distance of the interchangeable lens for imaging the field diaphragm (5, 5a, 5b, 5c, 5d).

Description

[0001] This is a compact light source assembly for an electrically powered lighting setup, suitable for macro photography, but also for video recording and professional macro filmmaking, including moving image recording. This light source assembly can be used, for example, when photographing small objects with dimensions significantly less than 40mm. Alternatively, the compact light source assembly can also be used in a lighting setup to illuminate objects at close range during the visual inspection of small details on larger objects, or for amateur or professional outdoor filming with a video camera, for example, when filming small creatures. State of the art

[0002] No lighting assemblies for macro photography or close-up video and film recordings are known in the prior art that are both compact and relatively inexpensive, and that also enable the sharply defined illumination of a small object or object details with dimensions of less than 40 mm using a very bright light spot or field. Furthermore, no compact lighting assemblies are known that can project a sharply defined light field onto the object at significantly different distances from 40 mm to 1000 mm from the lighting arrangement, with an illuminance of up to 300,000 lux, and that can also be powered by a battery.

[0003] The well-known Köhler lighting, sa https: / / www.spektrum.de / lexikon / optik / mikroskopbeleuchtung / 2056(Accessed 13.10.2023 [1]) is designed with a collector, a field diaphragm, and a condenser, which is usually either a compact, high-aperture, short-focal-length lens, a doublet, or a multi-lens condenser. Neither a compact, high-aperture, short-focal-length lens, a doublet, nor a multi-lens condenser used in a projector or microscope can produce a bright and sharp image of the field diaphragm, for example, at a free distance of up to 500 mm with a magnification of approximately 1:1. Furthermore, when imaging with a high-aperture, short-focal-length lens, significant aberrations can occur at the edges of the field diaphragm image if the field diaphragm has a diameter of, for example, 20 mm.Therefore, Köhler illumination with a compact, high-aperture, short-focal-length single lens, or even with a short-focal-length, multi-lens condenser, is generally unsuitable for macro photography. Theoretically, with Köhler illumination, the image of the light source is formed at infinity in the object space. However, this is not strictly necessary for macro photography or macro filming, as the typically shallow depth of field means that the image of the light source is sufficiently far away from the image of the field diaphragm. This ensures that the image of the light source is not visible at the location of the object being photographed.

[0004] Slide projectors have a condenser positioned in front of the slide, which in turn is followed by the projection lens. However, a typical slide projector cannot project a sharply defined light field at distances of 40mm to 500mm from the projector, with a field that is variably adjustable in its lateral extent. Furthermore, typical slide projectors use halogen lamps of at least 150 watts, which makes their use for macro photography difficult or even impossible, partly due to air turbulence from the ventilation system.

[0005] Godox offers the Godox S30 LED light, a system with 30 watts of electrical power consumption for advertising photography or video recordings, see [link / reference]. https: / / store.godox.eu / de / sonstige-modifikatoren / 5321-godox-sa-p1-projektionsvorsatz-fuer-s30-6952344218082.htmi (Accessed 13.10.2023) [2] is known. The diameter of the illuminated field in the Godox SA-P1 projection attachment is approximately 45 mm. This illuminated field is projected sharply. Thus, various patterns can be projected relatively sharply using different shading apertures of this size, in order to fully illuminate object details in an area of, for example, one square meter. However, even with the Godox SA-03 150 mm telephoto lens (150 mm focal length), the full projected light field is always significantly larger than 45 mm in diameter. By using a small aperture, a light field in the form of a light spot with, for example, a diameter of only 4 mm can be projected, but this will then only have moderately sharp edges and will not be very bright. These small projected light fields are, however, 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 even for film recording in the amateur or professional field in the outdoor area with light fields significantly less than 40 millimeters in lateral dimension and a very high illuminance in the light field.

[0006] The high-performance LED light sources FLEXILUX 4000 are manufactured by the company Schölly, see https: / / twidoo.at / Schoelly-Flexilux-4000-led?qgelid=EAlalQobChMlicillPz2gAMVypaDBxOm6QZNEAQYAiIABEgldxPD BwE (Accessed 13.10.08.2023) [3] offered with a fiber output. However, these light sources cannot produce a small, sharply focused spot of light at a free working distance of 50 mm.

[0007] The HEDLER Profilux LED650 from Hedler is an ultra-compact LED panel light with continuous light, see https: / / www.hedler.com / epages / es12071.sf / de DE / ?ObijectPath= / Shops / es12071 / Pr oducts / 5011 (Accessed 13.10.2023) [4]. This 75W LED panel light produces bright, daylight-quality light from a powerful LED. However, the HEDLER Profilux LED650 panel light is not suitable for macro photography, as it cannot produce a small, sharply focused field of light at a working distance of 50 mm and with a lateral dimension of less than 50 mm.

[0008] Patent DE 10 2022 001 895 B3 describes an arrangement for generating a spaced, adjustable light field for macro photography, particularly 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 an illumination arrangement, especially for macro photography. 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 positioned in front of the shading diaphragm or iris diaphragm in the aperture tube.

[0009] The invention described in German patent application DE 10 2020 121 652 A1 relates to a main body of image acquisition devices with an interchangeable lens, mounting devices for these, and flange focal distance adjustment elements, and in particular to main bodies of image acquisition devices on which mounting devices are interchangeable. However, this main body of image acquisition devices does not constitute a light source assembly. Objective of the invention

[0010] The aim is to teach how to economically utilize a comparatively inexpensive, compact light source assembly for a lighting arrangement, especially for macro photography or for close-up moving image recordings or also for film recordings in the amateur or professional sector in the outdoor field with light fields significantly less than 40 millimeters in lateral dimension. Object of the invention

[0011] The aim is to achieve a very high intensity of light from a projected light field for macro photography, macro filming (including close-up motion capture), and other close-up object illumination using a light source assembly integrated into a lighting system. The lateral extent of the projected light field should be adjustable within a wide range, but typically less than 40 mm. The light field should also be able to be focused at various depths in close-up range, above 40 mm and below 1000 mm, with a sharp edge. The achievable illuminance of the projected light field on the object, using this compact light source assembly within the lighting system, should be at least 50,000 lux and up to 500 lux.000 lux or even higher when a small light field is projected. In extreme cases, 800,000 lux to 1,000,000 lux should be achievable in the projected light field, which necessitates measures for eye safety. Ideally, no frosted glass should be present in the optical path of the light source assembly to avoid attenuating the light. Good to very good edge sharpness of the light field on the object and high uniformity of illuminance within the sharply defined light field should be achieved. Furthermore, continuous focusing of the light field over at least a portion of the depth, or stepwise adjustment of the focus position over the depth using technical aids, should be possible.Above all, the lighting assembly should allow for flexible adaptation to a wide variety of lighting situations, both in terms of the working distance to the object being photographed and the size and intensity of the light field. Furthermore, the intensity of the light illuminating the object, i.e., the illuminance, should be adjustable within broad limits – at least electrically – and adapted to the specific lighting task. In special cases, these settings should also be possible via remote transmission. A mobile phone should also be able to be used to control the illuminance within the light field. Description of the invention

[0012] This is a compact lighting assembly for a lighting setup, particularly suitable for macro photography or close-up motion capture. "Close-up" is defined here as the unobstructed area of ​​1000 mm or less between the front mechanical stop of the lighting setup and the nearest point of the object to the lighting setup. The compact lighting assembly preferably uses an LED or a group of LEDs as its light source, preferably operated with significantly more than 5 watts of electrical power, including operation at 100 watts.

[0013] This assumes the common fact that both amateur and professional photographers, especially those who practice macro photography with a macro lens on full-frame or APS-C cameras, usually also own a standard prime lens for full-frame or APS-C format with a fast aperture, typically an interchangeable lens. These interchangeable lenses often have apertures such as f / 1.4, f / 1.8, f / 1.7, f / 2, or f / 2.8. Such an interchangeable lens is usually unused during macro photography with a standard macro lens and is therefore readily available. Ideally, this interchangeable lens should also be manually focusable, as this simplifies handling when no cable or remote control is available.A standard interchangeable lens, unused in a photographer's equipment when using a macro lens (e.g., for 35mm, APS-C, or MTF format), can be used for illumination in macro photography. This lens illuminates the edge of a field diaphragm, preferably an iris diaphragm. This eliminates the need for a separate lens for illumination. However, in this case, the compact light source assembly should be specifically designed for this interchangeable lens and its flange focal distance. Alternatively, a very inexpensive, commercially available interchangeable lens—such as a video lens—can be used with a compact light source assembly. This lens should not be a standard lens and should not be used with a 35mm camera, as it is either already owned or can be acquired very cheaply.A manual interchangeable lens is highly preferable, especially when space is limited for macro photography, as manual lenses typically have a smaller diameter than motorized lenses. Furthermore, manual lenses usually allow manual adjustment of the aperture size, which controls the depth of field when creating a light source for illumination. Besides the lens already mentioned (and not used here for macro photography), this interchangeable lens could also be an inexpensive, but preferably fast, APS-C lens or an inexpensive, fast prime video lens.It can also be a C-mount interchangeable lens, and in rare cases a CS-mount interchangeable lens, although the focal length of the interchangeable lens used should generally not be less than 25mm if it is intended for macro photography with objects and object details larger than one millimeter. Manual lenses for the APS-C format with a Fuji X-mount are also suitable here, as their small outer diameter makes them advantageous for use on the light-emitting assemblies.

[0014] Accepting a significantly lower illuminance on the object - compared to a fast normal interchangeable lens with a fixed focal length - a commercially available zoom interchangeable lens with an aperture of 1:3.5 or even up to 1:4.5, which is often available to amateur photographers, can also be used successfully, for example, when flat, stationary objects with dimensions below 25mm are to be photographed using a camera on a tripod.

[0015] The compact light source assembly for a lighting arrangement, especially for macro photography or for close-up moving image recordings, is designed as follows: 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. 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 designed as an LED with a downstream, digitally controllable, spatial light modulator.

[0016] However, it is also possible that the light source is designed with an Ultra High Pressure (UHP) lamp or a halogen lamp.

[0017] The field aperture has an aperture plane and its optical cross-section is preferably pre-defined and adjustable.

[0018] The compact light source assembly is designed with a mounting surface as part of a lens mount for a commercially available interchangeable lens.

[0019] The field aperture is either a lens mount with a flat mounting surface for a lens shoulder in the design of a standard camera bayonet mount for the 35mm, APS-C, DX, Foveon or MFT format or a lens mount with a flat contact surface for a lens shoulder in the design of a standard or formerly standard camera thread mount, especially also for the 35mm format, positioned downwards. The contact surface may also be located on an extension tube.

[0020] The lens mount has a generally known nominal flange focal distance a_n according to the specification of a commercially active lens manufacturer for this lens mount.

[0021] The mounting surface is mechanically spaced from the aperture plane E of the field diaphragm by an effective flange focal distance a_eff downwards. This effective flange focal distance a_eff is calculated by adding the nominal flange focal distance a_n and a predetermined depth offset v. 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, as specified by a current or past commercial lens manufacturer. Preferably, when an interchangeable lens for 35mm or APS-C format is attached to the housing of the compact light source assembly, the maximum depth offset v can be v = 200 mm.

[0022] Here, a_n is the nominal flange focal distance (FFL) specified by the manufacturer for a standard camera bayonet mount or lens thread. This nominal flange focal distance, a_n, specified by the manufacturer in the past or present, 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, as specified by the lens manufacturer, as a positive value. A depth-of-field shift (v) that is less than or equal to half the nominal flange focal distance a_n, as specified by the manufacturer, is generally still well-suited for illumination purposes for a macro lens designed for a camera with a built-in reflex or semi-transparent mirror and for 35mm or APS-C format, i.e., a lens with a comparatively large nominal flange focal distance a_n.Such a macro lens can preferably be attached to the lens mount.

[0023] In contrast, a depth-of-field offset (v) that is less than or equal to 1.5 times the nominal flange focal distance (a_n) specified by the manufacturer is still well-suited for a macro lens designed for a mirrorless camera and for 35mm or APS-C format. Such a macro lens can preferably be mounted on the lens mount.

[0024] A depth offset v of v=0, i.e., when the nominal flange focal distance a_n equals the effective flange focal distance a_eff, is particularly well-suited for a macro lens, since its optical design is precisely tailored for the nominal flange focal distance a_n. Macro lenses can also be used with a negative depth offset v, where the effective flange focal distance a_eff is then smaller than the nominal flange focal distance a_n specified by the manufacturer. The effective flange focal distance a_eff can then be reduced to as little as 0.8 times the nominal flange focal distance a_n specified by the manufacturer. However, this only makes sense in exceptional cases, since a typical macro lens is usually designed for focusing at infinity.

[0025] A macro lens is preferably used with a depth offset v=0 or a positive depth offset v at the light source assembly. A true macro lens is generally defined as having a minimum magnification ratio of 1:2, according to the manufacturer's specifications, although many modern macro lenses also offer a magnification ratio of 1:1. In contrast, lenses that are not designed as true macro lenses are always operated here with a positive depth offset v at the light source assembly, which is preferably significantly greater than 0.2 times and generally significantly less than twice the focal length of this interchangeable lens.

[0026] The focal length f1 of the light-collecting lens is less than or equal to twice the nominal flange focal distance a_n of this lens connection 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 connection as specified by the commercial lens manufacturer.

[0027] 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 connection.

[0028] Preferably, the light source assembly uses an LED whose visible spectrum is similar to sunlight. A Color Rendering Index (CRI) of at least 90, ideally 95 or higher, is advantageous when high color fidelity is important to the photographer or filmmaker. The LED is preferably minimally structured or even unstructured, thus representing a largely homogeneous surface. This allows for achieving a projected light field with uniform illumination without significant adjustment effort and also reduces the requirements for the LED's alignment accuracy within the light source assembly. However, an LED with a rasterized structure in the illuminated field, for example, with 16 pixels in a 4x4 arrangement, can also preferably be used.Individual pixels can emit light with slightly different spectra, so that the complete superposition of the light from these pixels results in a good approximation of white light.

[0029] Preferably, the field diaphragm can be motorized and thus electrically controllable. Alternatively, the field diaphragm can be designed as an electrically controllable liquid-filled field diaphragm.

[0030] It is advantageous for beam shaping in the light source assembly and also for the utilization of light energy if the diagonal or diameter of the LED is significantly smaller than the nominal mounting distance a_n of a lens connection on the compact light source assembly. The LED can then be operated with an electrical power of up to 100 W. Preferably, the diagonal or diameter of the LED can also be smaller than one-quarter of the nominal mounting distance a_n of a camera connection of a camera with a built-in mirror.

[0031] The lens mount on the light source assembly is connected to a commercially available interchangeable lens. 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 designed on the compact light source assembly.

[0032] Therefore, the photo, video, film, or enlarger lens in question cannot be a macro lens. Nevertheless, it is primarily used here for close-up projection, for which it is not actually designed by the manufacturer, as the minimum focusing distance specified by the manufacturer for these lenses is usually greater than 7 to 10 times their focal length. The reduced image quality 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 enlarger lens from the field diaphragm—can often be accepted for the purpose of illuminating an object with a sharp field of light.Even at a 1:1 magnification ratio, moderately sharp images can usually be produced with a standard or telephoto lens from the photography, video, or reprographics fields. This is generally acceptable when illuminating an object by projecting the field diaphragm using such a lens, in terms of the achievable edge sharpness of the projected light field. Since the focus here is usually only on imaging the edge of the field diaphragm, field curvature or distortion of the interchangeable lens typically poses no disadvantage.However, if the demands on image quality when imaging the field diaphragm are higher, particularly with regard to chromatic aberrations, a macro lens must be used, or the magnification ratio for projection with 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 enlarging lens can also help to improve the image quality of this interchangeable lens significantly below its nominal close-up range.

[0033] A depth offset (v) value of 200mm can be useful for macro photography with this light source assembly if a telephoto lens with a focal length of, for example, 180mm is used to image the field diaphragm, and the object to be illuminated is located approximately 600mm from the telephoto lens, and the magnification ratio of the field diaphragm should be at least roughly 1:1. This replaces an expensive 180mm macro lens.However, with a telephoto lens with a focal length of 180mm, the illuminance in the light field can be significantly weaker than with a macro lens of the same focal length at the same aperture. This is because the macro lens can be operated with a depth of field (v) of zero, which significantly improves light transmission. This is because its rear lens element, which acts as the entrance lens, is generally not overexposed if the light source assembly is designed for shorter focal length lenses. Furthermore, using a macro lens offers clear advantages over a telephoto lens in terms of focusing and handling.However, it should be noted that when using a zoom lens with a depth 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 over a comparatively large depth range, for example up to one meter, by adjusting both the zoom focal length and the focus.

[0034] Furthermore, in exceptional cases, a light diffuser can preferably be arranged between the LED and the field aperture of the light source assembly. The light diffuser can be frosted glass, a frosted screen, a plastic film, or even a light-diffusing opaque surface. This can further improve the uniformity of the light distribution in the light field when very high demands are placed on this. Alternatively, a glass surface of the light-collecting lens can also be finely frosted, for example, if the light-collecting lens is designed as a plano-convex lens. In this case, the flat surface can be frosted. However, it is preferable to omit a light diffuser in the compact light source assembly, as this leads to significant light losses.

[0035] Furthermore, preferably in the compact light source assembly for an illumination arrangement with a lens mount of the type for a mirrorless camera, the depth offset v on the compact light source assembly is 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 the formats APS-C, DX, MFT or Foveon, 4 / 3-inch format, 35mm and medium format.

[0036] Furthermore, preferably in the compact light source assembly, with a lens mount of the type for a camera with a built-in reflex mirror or a semi-transparent mirror, the focal length f1 of the light-collecting lens can be less than or equal to 1.3 times the nominal flange focal distance a_n of this lens mount specified by the manufacturer. The maximum lateral dimension of the aperture of the field diaphragm can preferably be less than 1.3 times the nominal flange focal distance a_n of this lens mount specified by the manufacturer.

[0037] Furthermore, in the compact light source assembly, the focal length f1 of the light-collecting lens can preferably be between 10mm and 40mm and its numerical aperture can be at least 0.4.

[0038] Furthermore, in the compact light source assembly, the focal length f1 of the light-collecting lens can preferably be between 18 mm and 28 mm. Lenses in this focal length range are well suited to an arrangement with a lens mount having a nominal flange focal distance a_n between 17 mm and 47 mm, according to the manufacturer's specifications.

[0039] Furthermore, the light-collecting lens in the compact light source assembly can preferably have a focal length f1 of 26 mm. The diameter of the light-collecting 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 light source assembly with a lens mount having a nominal flange focal distance a_n between 17 mm and 47 mm, according to the manufacturer, when 35mm or APS-C camera lenses are to be used for projecting the light field lens, although video lenses are not excluded.

[0040] Furthermore, in a lens mount on the light source assembly – in a camera design – the depth offset v can be predefined with a positive value between v = 8 mm and v = 150 mm. Within this depth offset range, the magnification of the projection, betaP_strich, can be adjusted within wide limits for projection lenses with focal lengths from 50 mm to 200 mm. With a depth offset v of v = 16 mm, a magnification of approximately 2:1 can generally be achieved with a 35mm camera lens with a focal length of around 50 mm when focused on close-up subjects.

[0041] Furthermore, with a lens connection on the light source assembly – in a camera design – the depth offset v can be predefined by a positive value of v = 21.5 mm. With this depth offset of v = 21.5 mm, a standard photographic lens, for example, with a focal length of 55 mm, which is used here to project the field diaphragm – also in its iris configuration – can achieve a magnification ratio betaP_strich of approximately 2:1, provided the focusing capability of this standard photographic lens is also utilized. This magnification ratio betaP_strich of approximately 2:1 results from the focusing mechanism built into the interchangeable lens, which typically requires a depth shift of at least 8 mm for focusing. With a depth shift of 6 mm, the focal point distance for the field diaphragm is 21.5 mm + 6 mm = 27.5 mm.From this focal point distance of 27.5 mm, the resulting magnification ratio betaP_strich is 55 mm / 27.5 mm = 2:1. Generally, the image quality of a standard photographic lens with a magnification ratio of betaP_strich for projection of 2:1 is still sufficiently high for the requirements of illuminating a subject in the macro range. Any chromatic aberrations that may then be slightly present at the edges of the light field are, in most cases, still tolerable for macro photography. For more demanding applications, this standard photographic lens with a 55 mm focal length – with a depth of field shift v of v = 21.5 mm – must be focused at infinity, meaning the depth of field shift on the lens itself must be set to zero. Because with a magnification ratio betaP_strich of 2.6:1, the image quality of a normal photo lens is already slightly better than with a magnification ratio betaP_strich of 2:1.However, with a magnification ratio (betaP_strich) of 2.6:1, the illuminance is significantly lower than with a magnification ratio 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 depth offset (v) of less than 21.5 mm must be achieved in the compact light source assembly.

[0042] Furthermore, the light source in the compact lighting assembly can preferably be equipped with a current controller for electrical operation, to which a battery is preferably connected. If the light source is designed as an LED, a group of LEDs, or an LED array, the operating current for these LED-based light sources can be set using the current controller. The battery thus serves to electrically power at least one LED. The light source in the compact lighting assembly can also preferably be powered by a battery unit. This fulfills the requirement for illuminating objects in the field with the compact lighting assembly.

[0043] Furthermore, a single LED, a group of LEDs, or an LED array can preferably be operated in the compact light source assembly with an electrical voltage between 11.5V and 12.5V. An operating voltage of 11.5V to 12.5V for LED 1 is particularly well suited for battery operation.

[0044] 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 aperture blades. This allows the size of the illuminated field to be precisely adjusted to the requirements of macro photography.

[0045] Furthermore, the light field aperture 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.

[0046] Furthermore, the light field aperture in the compact light source assembly can preferably be designed as an electrically controllable liquid aperture. This also enables remote control of the liquid aperture. The remote control can be wired or wireless.

[0047] Furthermore, the compact light source assembly may preferably incorporate a lens mount for a commercially available or formerly commercially available interchangeable lens for 35mm or APS-C format cameras. This could include bayonet mounts such as 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 previously commercially available and are now available secondhand or from private individuals.

[0048] Furthermore, the lens mount on the compact light source assembly can preferably be designed with a thread for a currently or formerly commercially available interchangeable lens. This can be a lens mount for an interchangeable lens with a thread of M42x1, M39x1, M39x1 / 26" (LSM), M39x0.75, M39x0.5, C-mount or CS-mount.

[0049] This also includes interchangeable lenses that were once commercially available and are now available on the second-hand market or from private individuals.

[0050] The following camera mounts, for example, can also be used as connections on the compact light source assembly for mounting 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.

[0051] Furthermore, preferably at least one fixed or variable intermediate ring with a lens mount for an interchangeable lens with a bayonet mount can be arranged in the compact light source assembly. This allows the effective flange focal distance a_eff to be increased with just a few steps to obtain a smaller or larger magnification betaP_strich or to advantageously attach a longer or shorter focal length interchangeable lens to the compact light source assembly for projection. The advantage is that a longer focal length interchangeable lens, for example with a focal length of 135 mm, allows for a greater distance to the projected light field. This compares to an interchangeable lens with a focal length of, for example, 50 mm, assuming the magnification betaP_strich is the same in both cases.

[0052] Furthermore, preferably at least one fixed or variable intermediate ring with a lens connection for an interchangeable lens with a thread on the compact light source assembly can be arranged in the compact light source assembly. This allows the effective flange focal distance a_eff to be increased in order to obtain a smaller magnification factor betaP_strich or to allow the attachment of a longer focal length interchangeable lens for projection to the compact light source assembly, which then enables a greater free distance to the projected light field.

[0053] Furthermore, a bellows focusing device with a lens mount for an interchangeable lens of the type used for a camera 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 preferably be permanently mounted to the compact light source assembly. Alternatively, a bellows focusing device with a lens mount in the form of a bayonet or threaded mount can preferably be attached to the compact light source assembly if the compact light source assembly has a lens mount of the type used for a camera. This bellows focusing device enables very flexible depth adjustment for the interchangeable lens and can be supplied by Quenox.

[0054] In the compact light-gathering lens assembly, a field lens with a focal length of f2 is arranged downstream. This field lens, together with the light-gathering lens, forms a condenser assembly that concentrates the light towards the field diaphragm. The field diaphragm can be a mechanical iris diaphragm, a motorized iris diaphragm, a diaphragm with linearly adjustable shutters, or a liquid diaphragm. The field lens thus concentrates the light downstream of the field diaphragm. A small distance between the field lens and the field diaphragm, for example 5 mm to 15 mm, is advantageous because it prevents dust particles on the field diaphragm from being sharply focused in the projected light field. The field lens can preferably be mounted directly on the mechanical housing of the field diaphragm on the light-upward side.On the other hand, an interchangeable field lens can preferably be arranged to optimally adapt to the respective downstream interchangeable lens, which could be, for example, a 35mm camera lens with a focal length range between 35mm and 180mm. The interchangeable lens can also be designed for the APS-C format within this focal length range. Furthermore, the interchangeable lens can be a video lens (also known as a TV lens or CCTV lens), a film lens, or a magnifying lens, and can also be used at different distances. Consequently, the effective entrance pupil of this interchangeable lens is also at a different depth position, which can be accommodated by an illuminated field lens adapted to the focal length.It should be noted that in the arrangements described here, the entrance lens is the rear lens when using these interchangeable lenses in the standard way.

[0055] Even older camera lenses are well-suited as interchangeable lenses for this compact light source assembly. The Revuenon 55mm f / 1.7 and the Pentacon 50mm f / 1.8 are just two examples. A zoom lens can also be used with this compact light source assembly, for example, with a focal length range of 35mm to 70mm, 70mm to 200mm, or 100mm to 300mm. Zoom lenses are particularly well-suited for this compact light source assembly, as they allow light fields to be created at widely varying distances from the lens. Because of the completely atypical use of a zoom lens—that is, far from its nominal flange focal distance (a_n)—its focal length setting can also be used to focus the light field for illumination.

[0056] Furthermore, an electrically controllable liquid lens can preferably be assigned to the lens connection in the compact light source assembly. This electrically controllable liquid lens can be integrated into the lens connection. This also enables remote control of the liquid lens. The remote control can be wired or wireless, as already described.

[0057] Furthermore, the LED can preferably be arranged intrafocally in the compact light source assembly in front of the light-collecting lens with focal length f1, and the focal point distance z1 to the light-collecting lens can preferably be defined as follows: z1 less than or equal to 0.7*f1 2 / f2 and z1 greater than or equal to 0.3*f1 2The focal distance z1 must be maintained. Preferably, when a light-collecting lens with a focal length f1 of 26 mm and a field lens with a focal length f2 of 75 mm are arranged, the focal distance z1 can be greater than or equal to 2.7 mm and less than or equal to 7 mm. However, preferably, the focal distance z1 when a light-collecting lens with a focal length f1 of 26 mm and a field lens with a focal length f2 of 75 mm can also be arranged in a range greater than or equal to 3.6 mm and less than or equal to 5.4 mm. Maintaining this range can result in a uniformly illuminated light field after an interchangeable lens with an effective flange focal distance of a_eff = 65.5 mm when an iris diaphragm with a maximum diameter of 20 mm is used.

[0058] Furthermore, preferably in the compact light source assembly, the relationship z1 can be equal to 0.5*f1 2 / f2' must be maintained, where z1 represents the focal point distance, which here is an intrafocal focal point distance. The focal point distance z1 in the arrangement of a light-collecting 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 preferably also 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-collecting lens is preferably the aspherical condenser lens type ACL3026U-A from ThorLabs, which has a focal length of 26 mm.

[0059] Furthermore, the 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 field lens, the shorter the focal length of the interchangeable lens attached to the compact light source assembly can be, in order to achieve good photometric matching that enables high illuminance in the generated light field.

[0060] Furthermore, the illumination field lens can preferably be configured with a focal length f2 of 75 mm in the compact light source assembly. This is advantageous if an interchangeable lens is to be used to generate the light field, for example, from the focal length range of 50 mm to 135 mm.

[0061] Furthermore, the illumination field lens can preferably be configured with a focal length f2 of 50 mm in the compact light source assembly. 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 35 mm to 60 mm.

[0062] Furthermore, the illumination field lens can preferably be configured with a focal length f2 of 35 mm in the compact light source assembly. 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 30 mm.

[0063] Furthermore, the illumination field lens in the compact light source assembly can preferably be configured with a focal length f2 of 30 mm or 25 mm. 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 25 mm.

[0064] Furthermore, the compact light source assembly can preferably incorporate electrical means for wired or wireless remote control of a motorized iris diaphragm or a liquid diaphragm. These electrical remote control means are used 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 within the field diaphragm to operate the diaphragm elements located within it. By wiring the electric motor for adjusting the field diaphragm, which is then designed as an adjustable iris diaphragm, the prerequisites for remote-controlled adjustment of the field diaphragm are also met.

[0065] Furthermore, a bayonet mount with original electrical contacts can also be arranged on the compact light source assembly. These electrical contacts then supply the current for focusing the interchangeable lens to produce a sharp or selectively blurred image of the field diaphragm, and also the current for adjusting the aperture diaphragm to control the depth of field and brightness of the illuminated field. This bayonet mount with its original electrical contacts is connected to a corresponding contact with a cable for connection to an electrical control panel. This control panel can then include a control for the aperture diaphragm of the interchangeable lens and another for focusing this electrically operated interchangeable lens.This control panel also allows for the precise adjustment of the LED's operating current and the diameter of the electrically operated field diaphragm. These controls—similar to knobs—can be mechanically adjustable or implemented on a touchscreen. This enables optimal lighting adjustment in macro photography or videography of live insects or small animals in their natural habitat, even from a distance. It also allows for precise adjustment of the light field's brightness by modifying the LED's operating current, the aperture setting on the interchangeable lens of the compact light source assembly, and the ability to selectively switch the light on and off, including short exposures.

[0066] The greater the depth offset v is realized in the compact light source assembly, the smaller, according to the laws of geometric optics, the depth range in which the projected light field can still be imaged with a sharp edge.

[0067] Crucial for achieving high illuminance in the projected light field is the effective diameter of the rear lens of the interchangeable lens, which acts as the entrance lens for the field diaphragm. However, the size of the lens's aperture diaphragm is not the only determining factor. While a large aperture diaphragm, and thus high light intensity, always implies a large effective diameter for the rear lens, interchangeable lenses with the same aperture ratio can have significantly different effective diameters.For example, the Zhongyi Creator 135mm f / 2.8 camera lens has a comparatively large effective rear lens diameter of at least 30mm, making it particularly well-suited for imaging the field diaphragm, provided the diameter of the entrance light beam is also of this size. In contrast, the older Revuenon-special 135mm f / 2.8 camera lens, with the same nominal aperture of f / 2.8 as the Zhongyi Creator 135mm f / 2.8, has a significantly smaller rear lens. The Revuenon-special 135mm f / 2.8 lens has a rear lens diameter of only approximately 24mm.

[0068] Macro lenses typically have a fixed rear lens element, whose effective diameter is generally significantly larger than that of a non-macro lens, even with the same nominal aperture. This makes macro lenses particularly well-suited for use in compact light source assemblies, despite their typically much smaller aperture ratio compared to non-macro lenses, such as standard lenses. As a result, the achievable illuminance in the projected light field with a macro lens can be nearly equivalent to that of a non-macro lens, even though the latter has a significantly larger aperture. This is due to their atypical application, as the aperture diaphragm, always present in macro, standard, or telephoto lenses, does not effectively limit the beam at full aperture; instead, the rear lens element's mounting takes over this function.The rear lens of the objective is used here as the entrance lens, since the macro lens or the normal or telephoto lens is used here as a projection lens.

[0069] Due to the non-zero depth offset v introduced here, a non-macro lens is not used according to its optical design. Therefore, its aperture stop does not necessarily correspond to the effective entrance pupil, but rather to the effective diameter of the rear lens element. This tendency intensifies with increasing depth offset v. However, it can be shown that the image quality, even outside its specifications, remains sufficiently good when using a macro lens for illumination with a compact light source assembly in this atypical application.

[0070] For example, the rear lenses of the 7Artisans 50mm f / 1.4 camera lens and the 7Artisans 60mm f / 2.8 macro lens are quite similar in size, although their apertures are very different. Thus, with a magnification ratio of approximately 2:1 when projecting a light field, the 7Artisans 60mm f / 2.8 macro lens is only slightly less than 20% inferior to the 7Artisans 50mm f / 1.4 camera lens in terms of achievable illumination within the light field, which in no way corresponds to the ratio of the apertures of the two lenses.

[0071] Furthermore, the compact light source assembly can preferably be arranged on a parallel kinematic arrangement, such as a hexapod. This allows for the necessary alignment of the light field with stationary as well as moving objects during filming, video recording, and macro photography, when a larger object area needs to be scanned successively to locate relevant areas. Alternatively, the compact light source assembly can preferably be arranged on an angle-adjustable system with separate adjustment of the vertical and horizontal angles. Moreover, the compact light source assembly can preferably also be arranged separately from the camera on a single-axis or multi-axis robot arm to allow virtually unrestricted access to the object being 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.

[0072] Furthermore, an interchangeable lens for imaging the field diaphragm, which can be a camera lens, is preferably associated with at least one additional lens with a focal length between 100 mm and 1000 mm. This can be a commercially available close-up lens such as those used in macro photography, which acts as an auxiliary lens. A focal length of 100 mm corresponds to 10 diopters of optical refractive power. Due to this positive refractive power of the additional lens, the sharply focused light field is brought closer to the interchangeable lens for imaging the field diaphragm, which can be advantageous for close-range illumination. The light field also becomes significantly brighter with the addition of an additional lens, as the size of the projected light field is then considerably reduced.Preferably, an additional lens, which acts as a supplementary lens, with a refractive power between one and three diopters is used to minimize chromatic aberrations in the imaging of the light field. Furthermore, the additional lens can preferably be an achromatic supplementary lens from the Japanese company Marumi, which can then have a refractive power between three and five diopters. Compared to a single lens placed in front of the image, an achromatic supplementary lens significantly reduces chromatic aberrations at the edge of the light field.

[0073] Furthermore, a small shading diaphragm can be positioned in front of the entrance lens of the interchangeable lens, for example, at the lens mount of the compact light-emitting diode assembly. This creates an annular aperture diaphragm. This can be used to adjust the light spectrum if the color of the light changes across the cross-section of the light beam entering through the entrance lens. For example, if the light in the center of the beam is slightly red-biased. This effect occurs when a rasterized LED is used, whose individual elements emit light of different colors, and this light is not perfectly balanced with respect to white light, with the elements in the center of the LED emitting red-biased light.

[0074] Furthermore, the compact light source assembly can be integrated into an electronic network together with the digital camera for capturing moving scenes in macro photography. This allows for the control of the light source's current and the opening of the field diaphragm during film or video recording. Using a computer program, the compact light source assembly's settings can be optimized for the lighting conditions based on the camera's preset settings. In this configuration, the camera acts as the "master" and the compact light source assembly as the "slave." The interchangeable lens on the compact light source assembly can also be integrated into this network as a controllable component, provided its aperture and focus can be controlled externally, as is already possible with modern interchangeable lenses.Macro lenses, which allow for a large depth of field, are particularly suitable as interchangeable lenses in this context. This enables photographers, videographers, and filmmakers to optimally utilize the compact lighting system in the wild, even in animal burrows, according to the requirements of the shot, while incorporating the motorized and remotely controlled interchangeable lens. The optimal settings for electrical power at the light source, the size of the field diaphragm, the focus of the interchangeable lens, the zoom focal length setting (in the case of a zoom lens), and the aperture setting of the interchangeable lens can all be optimized during the shooting process by a computer program or artificial intelligence. This allows the photographer to fully concentrate on the subject and on creative aspects. Description of the characters

[0075] The invention is implemented by means of theFig. Figures 1 to 17 and five embodiments without figures are described, none of which are drawn to scale. Furthermore, in all figures and in the five embodiments, the focal length f1 of the light-collecting lens 4 is always 26 mm.

[0076] The Fig. Figure 1 illustrates the principle of a compact light source assembly. The white LED 1, with a square luminous surface area of ​​approximately 6 mm and a heat sink (not shown), emits white light and is powered by a high-performance battery 3 via a current controller 2. The LED 1 is a getian-gt-fc40 type, which has a high color rendering index and operates at approximately 12 V. The operating current for the LED 1 is adjustable via the current controller 2 within a wide range, up to 2 A at approximately 11.6 V. This current controller 2 is connected to a battery 3 and thus regulates the luminous flux emitted by the LED 1 as needed when illuminating an object. However, the maximum possible current is 4 A at a voltage of 12.5 V. The light from the LED 1 then strikes a light-collecting lens 4.This is a short-focal-length, asymmetrical plano-convex lens whose flat surface faces LED 1. This light-collecting lens 4 focuses the light from LED 1 downwards. LED 1 is positioned in the focal plane FE1 of the light-collecting lens 4, resulting in an image of LED 1 at infinity and a focal point separation of z1=0. The point PA on the illuminated front surface of LED 1, which lies on the optical axis OA, therefore coincides with the front focal point F1. The focal length of the light-collecting lens 4 is 26 mm. The sharply defined field diaphragm 5 has an open transmission area with a diameter of 20 mm. The diameter of the light beam is sharply limited by the field diaphragm 5. The light in the opening of the field diaphragm 5 constitutes a field LF.The distance between the flat surface of the light-collecting lens 4 and the field diaphragm 5 is 27 mm, which is 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 attaching an interchangeable lens. This lens mount 6 has a mounting surface A to which a commercially available interchangeable lens can be attached. This includes not only new lenses but also older lenses from the second-hand market, often referred to as vintage lenses. These older lenses are still frequently found in the possession of amateur photographers. The lens mount 6 with the mounting surface A is positioned here at 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 here is a_n = 46.5 mm.The nominal flange focal distance a_n is given by the distance from the mounting surface A to point PA. It corresponds to the nominal flange focal distance a_n according to Nikon's specifications for 35mm lenses for a single-lens reflex camera.

[0077] The field aperture 5 with the aperture plane E is comparatively far from point PA. Therefore, there is a significant depth offset v when mounting an interchangeable lens to the mounting surface A. This depth offset v is [value missing in original text]. Fig. 1 v = 39 mm. This results in an effective flange focal distance of a_eff = 86.5 mm, the sum of the nominal flange focal distance a_n of 46.5 mm and the depth offset v of 39 mm for a short telephoto lens (not shown here) for 35 mm format SLR cameras with a focal length of 85 mm. When this telephoto lens is attached to the lens mount 6 with contact surface A, it sharply focuses the edge of the field diaphragm 5 with the illuminated field LF, thus creating a light field (not shown here) for illuminating an object in macro photography. This telephoto lens thus acts as a projection lens. The illuminated field is then magnified by the amount of the magnification ratio betaP_strich of 2.2:1 at an effective flange focal distance of a_eff = 86.5 mm when this 85 mm telephoto lens (not shown here) is focused at infinity.The image scale of the projection betaP_strich of 2.2:1 corresponds to an image scale of betaF_strich of 0.45:1 in typical photographic use of the telephoto lens. However, this was not within the intended range of the optical design of the commercial manufacturer for this telephoto lens. A weak telephoto lens for 35mm film format with a focal length of 85mm and an aperture of f / 2.0 or f / 1.8 typically has a minimum focusing distance of slightly less than one meter, for example, 850mm, according to the manufacturer's specifications, and is therefore not designed for imaging significantly closer than this minimum focusing distance of one meter.Since this interchangeable lens is intended solely for illumination purposes as a projection lens and not for use as a camera lens for image capture, minor image defects such as slight blurring, field curvature, distortion, and minor chromatic aberrations, which may occur at the edges of the projected light field, are generally acceptable, both theoretically and practically. Field curvature and distortion are of secondary importance in this context. Even at magnifications such as 6x, the blurring at the edges of the light field is usually barely perceptible, if at all, to the naked eye. The illuminated field diaphragm (5) has a diameter of 20 mm.These aberrations at the edge of the light field should therefore usually be tolerable for illumination in macro photography using a light field. However, if very high demands are placed on the image quality of the sharply rendered light field, an expensive macro lens or a repro lens must be used to image the illuminated field—and not a normal or telephoto lens outside its specifications. In this case, the depth of field (v) for a macro lens should be set close to zero. A macro lens can generally still deliver sufficient image quality for rendering the sharp edge of the illuminated field if the depth of field (v) is not significantly more than one-third of the focal length of the macro lens.

[0078] With the previously mentioned magnification ratio betaP_strich of 2.2:1 for the projection, a telephoto lens for 35mm SLR cameras with a focal length of 85mm and an aperture of f / 2.0 can still achieve an illuminance of 150,000 lux in the magnified light field with a usable area of ​​40mm in 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.

[0079] When a Zhongyi Creator 85mm f / 2.0 telephoto lens is fitted with a 4-diopter achromatic close-up lens at infinity focus, the resulting projection magnification is 1.25:1, and the illuminance in the projected light field with a diameter of 20mm reaches approximately 350,000 lux at a distance of 120mm. Conversely, when this Zhongyi Creator 85mm f / 2.0 telephoto lens is set to its close-focus position of 0.85m, the distance is 105mm, and the illuminance in the projected diameter reaches approximately 400,000 lux, with a projection magnification of 1.08:1 and a power consumption of 23W.

[0080] The Fig. Figure 2 represents a compact light source assembly with a lens mount 6a for an interchangeable lens via a bayonet mount. A Canon EF-mount camera lens can be attached to this mount to form an illumination arrangement. For this purpose, the lens mount 6a is designed with a contact surface A. The LED 1, with a heat sink (not shown) on a tube 7, emits white light that closely resembles the spectrum of sunlight and is powered by a high-performance battery 3 via a current controller 2. As in [reference to figure], the [reference to figure] Fig. The white LED 1, type getian-gt-fc40, is used. It has a high color rendering index and operates at approximately 12V. The power consumption of this LED 1, which has a square luminous area measuring 6mm × 6mm, is up to 50W when a current of 4A and a voltage of 12.5V are set. This LED 1 has a rasterized structure with 16 individual luminous fields in a 4x4 arrangement. The operating current for the LED 1 is therefore adjustable within a wide range up to a maximum of 4A via the current controller 2. The current controller 2 is connected to the battery 3 and thus regulates the luminous flux emitted by the LED 1 as needed when exposing a photographic subject in macro photography or filming, especially outdoors.The light from LED 1 strikes a light-collecting 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, single-sided aspherical plano-convex lens, whose flat surface faces LED 1. This light-collecting 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-collecting lens 4 focuses the light from LED 1 downwards. LED 1 is positioned approximately 3.4 mm away from the light-collecting lens 4, corresponding to the focal point distance z1, i.e., extrafocally. With this value of -3.4mm for the extrafocal focal point distance z1, a fairly uniform illumination is created in the passage area of ​​a mechanical iris diaphragm 5a, which is opened to a diameter of 20mm and determines the diameter D_F of the illuminated field LF in the aperture plane E.The distance between the iris diaphragm 5a and the planar surface of the light-collecting lens 4 is 27 mm. The aperture blades 5b of the iris diaphragm 5a define the aperture 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 illuminated field LF in the aperture plane E.

[0081] The optimal focal point distance z1 of -3.4 mm for good illumination can vary slightly from lens 4 to lens 4 and also due to the specific design of the compact light source assembly. Therefore, the LED 1 should generally be finely adjusted in depth using mechanical means (not shown here) during the assembly of the light source. The diameter of the light beam can be adjusted using the iris diaphragm 5a with its mechanically adjustable aperture blades 5b (diameter D_F). The light passing through the iris diaphragm 5a (with a diameter D_F = 20 mm) within the aperture blades 5b enters the bellows focusing device 8 and passes through the front-mounted bayonet 6a, which is a Canon EF bayonet mount for a full-frame SLR camera.The attachment of the bellows close-adjustment device 8 to the tube 7 is also formed here by a bayonet connection of type EF from Canon, which is not shown in detail.

[0082] This bayonet mount 6a can be moved a considerable distance of 100 mm using the bellows focusing device 8. Point PA lies on the optical axis OA at a distance of a_n = 44 mm from the bayonet mount 6a positioned here, where a_n is the nominal flange focal distance according to Canon's specifications for EF lenses for the 35mm format SLR camera.

[0083] However, the iris diaphragm 5a with the aperture plane E is comparatively far from this point PA, namely by the depth offset v with a magnitude of 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 mount can be attached. This depth offset v is therefore in Fig. 2 v=67.5mm. This results in an effective flange focal distance of a_eff=111.5mm as the sum of the nominal flange focal distance a_n of 44mm and the depth offset v of 67.5mm for an interchangeable lens that can be flanged to the mounting surface A, but is not shown here.

[0084] The approximately sharp image from LED 1 is created here in Fig. 2 in the image plane BE1 with a focal length s1' of approximately 200 mm. This focal length s1' is measured from the curved surface of the light-collecting lens 4 with a focal length f1 of 26 mm and is calculated from the extrafocal focal distance z1 of the LED 1 from the front focal plane FE1 of the light-collecting lens 4, which here is z1 = -3.4 mm. The extent of the illuminated image of the square LED 1 with a 6 mm side length of the illuminated area then has an edge length of approximately 46 mm at a focal length s1' of approximately 200 mm. In the position of the entrance lens of a flanged interchangeable lens in focus at infinity, which is then about 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 about 25mm.This ensures, for example, that the rear lens of a Zhongyi Creator 135mm f / 2.8 interchangeable lens, which serves as the entrance lens and has a diameter of approximately 30mm, is well illuminated without being overexposed. Thus, good optical matching is achieved when such an interchangeable lens, with a rear lens diameter of 30mm, is attached to the mounting surface A of the 6a bayonet mount. 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 interchangeable lens is 360mm. The magnification of the projection is then 2:1. In the enlarged light field of 40mm diameter, which results from the diameter of the luminous field LF in the aperture plane E of D_F=20mm at the stated amount of the magnification, an illuminance of approximately 150 can then be achieved.000 lux in the projected light field can be achieved when LED 1 is operated with a current of 2A and a voltage of 11.6V. The Zhongyi Creator 135mm f / 2.8 telephoto lens is set to infinity.

[0085] If an achromatic close-up lens with 3 diopters is also attached to the Zhongyi Creator 135mm f / 2.8 telephoto lens with an effective flange focal distance of a_eff=111.5mm, the resulting magnification of the projection of betaP_strich is approximately 1:1 and the illuminance in the projected light field of 20mm diameter reaches approximately 450,000 lux at a distance of 170mm. By using an achromatic close-up lens with 5 diopters on the Zhongyi Creator 135mm f / 2.8 telephoto lens, an image 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 120mm from the lens mount with an operating current of 2A and a voltage of 11.6V at LED 1.

[0086] With this Zhongyi Creator 135mm f / 2.8 interchangeable lens and without attaching a supplementary lens, an illuminance of approximately 270,000 lux can still be achieved in a well-illuminated light field of 20mm diameter at an image scale (betaP_strich) of approximately 1:1 and an effective flange focal distance (a_eff) of 179mm, which can be set using the bellows focusing device 8. The free working distance of the light field is approximately 235mm from the front mount of the interchangeable lens. The electrical power at the LED 1 is then also around 23W. In the arrangement according to Fig. 2. The depth position of LED 1 is quite uncritical, i.e., the change in the focal point distance z1, since with this arrangement the cross-section of the beam containing the main portion of the light energy in front of the rear lens of the Zhongyi Creator 135mm f / 2.8 interchangeable lens changes only very slightly when LED 1 is shifted in depth. Here, we are only concerned with a change in the focal point distance z1, but only in the range of a few tenths of a millimeter.

[0087] Is the compact light source assembly being adjusted? Fig. 2. Now, an older, widely available interchangeable lens, the Revuenon-special 135mm f / 2.8 (not shown here), focused at infinity, is attached to the Canon EF mount via an adapter for the M42 thread connection. When the effective flange focal distance of a_eff = 111.5mm is again set on the bellows focusing device 8, a blurry image of the LED1 is then created, at least approximately, in the position of the rear element of this interchangeable lens, which is used here as the entrance lens. However, this image is now slightly overexposed. This is because the rear element of this Revuenon-special 135mm f / 2.8 interchangeable lens only has a usable diameter of approximately 23mm.This rear lens element, with its mechanical mount, then acts as the effective entrance pupil of the interchangeable lens, since it is not operated at the nominal flange focal distance a_n of 45.46 mm specified by the lens manufacturer for the M42 lens mount, where the image of the built-in mechanical lens diaphragm, the aperture diaphragm of the camera lens, represents 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 with this Revuenon-special 135 mm f / 2.8 interchangeable lens (not shown here) at a working distance of approximately 405 mm, and the magnification of the projection is at least approximately betaP_strich = 2:1. This interchangeable lens, Revuenon-special 135mm f / 2.8, which is not shown here, serves to sharply image the edge of the aperture blades 5b of the iris diaphragm 5a.Since this is an illumination optic, image defects such as chromatic aberrations, resulting from the use of this older Revuenon-special 135 / 2.8 interchangeable lens far removed from the manufacturer's optical design, are in most cases still quite tolerable. This is because this interchangeable lens is not designed for a 2:1 magnification ratio, as it is not a macro lens. The unusual use of the Revuenon-special 135mm f / 2.8 camera lens allows for the following arrangement: Fig. 2. At a magnification of approximately 2:1 (betaP_strich), an illuminance of approximately 105,000 lux is achieved. The light field is illuminated quite evenly and has a diameter of 40 mm with an electrical power of 23 W at LED 1. However, the optical adaptation of this Revuenon-special 135 mm f / 2.8 interchangeable lens is not entirely optimal here, as the rear lens element only has a usable diameter of approximately 23 mm.

[0088] With this Revuenon-special 135mm f / 2.8 interchangeable lens, an illuminance of approximately 160,000 lux can be achieved in a well-illuminated light field of 20mm diameter at a working distance of approximately 265mm, with a magnification ratio (betaP_strich) of approximately 1:1. For this, an effective flange focal distance of a_eff = 179mm is set on the bellows focusing device 8. The electrical power consumption is then also 23W at the LED.

[0089] The Fig. Figure 3 shows an arrangement of a compact light source assembly in the training according to Fig. 2, in which the bellows 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 the manufacturer, for example, the former Dresden-based company Pentacon as well as 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 therefore 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 a 1:1 magnification ratio. The free working distance of the light field from the mount of the aforementioned camera lens is then approximately 265 mm.However, other, often still existing, older lenses with an M42x1 lens mount 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 here represents the entrance lens, of at least 23mm in diameter and even better 25mm in diameter, in order to produce a bright and sharply defined light field in the close range.

[0090] The arrangement according Fig. The compact light source assembly 4 also features a light-collecting lens 4 with a focal length f1 = 26 mm. The set depth offset v is 51 mm, resulting in an effective flange focal distance a_n of 95 mm with the nominal flange focal distance a_n – the value specified by Canon as a_n = 44 mm for the EF lens mount. The white LED 1, type getian-gt-fc40, is positioned extrafocally in front of the light-collecting lens 4 at a focal point distance z1 of -1.3 mm. The real image B1' of the LED 1, not shown here, is formed at a focal length f1 of 26 mm and a distance s1' of 520 mm from the lens vertex of the light-collecting lens 4. The real image point PL' is shown here as the image of the point PL on the LED 1.A Canon 70-200mm f / 4.0 L zoom lens (not shown) can be attached to this compact light source assembly via bayonet mount 6a, which is a Canon EF mount. This zoom lens is used for projection. It features a rear lens that serves as the entrance lens for the light exiting the iris diaphragm 5a. The diameter of this rear lens is at least 30mm, allowing the light passing through iris 5a to enter the lens unimpeded. When this zoom camera lens is set to a focal length of approximately 80mm and focused at close range, an illuminance of approximately 150,000 lux is achieved in the light field shown at a free working distance of 100mm, when the LED 1 is operated with 23W of electrical power.The light field is created here with a 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.

[0091] If, on the other hand, the Canon 70-200mm f / 4.0 L zoom lens is set to a focal length of 200mm, the resulting working distance at close range is approximately 515mm. With 23W of electrical power at LED 1, this results in an illuminance of approximately 100,000 lux in a light field with a diameter of 44mm, assuming the setting of the iris diaphragm 5a remains unchanged. The magnification ratio betaP_strich is then 1.9:1. When this zoom lens is set to infinity and has a zoom focal length of 200mm, the working distance is even approximately one meter. Thus, a compact light source assembly with the specifications shown here can achieve this. Fig. The training described in section 4, in conjunction with a zoom camera lens, allows for very high flexibility regarding the working distance while making good use of light energy. The working distance can be adjusted from 100 mm to approximately one meter. With the older Soligor 85-208 mm f / 3.9 zoom camera lens, the compact light source assembly can be used in the training according to... Fig. The Soligor 85-208mm f / 3.9 lens achieves comparable free distances to the Canon 70-200mm f / 4.0 L zoom lens. However, the achievable illuminance in the light field is approximately 20% to 50% lower compared to the Canon 70-200mm f / 4.0 L zoom lens. This is attributed, in part, to the significantly smaller rear element of the Soligor 85-208mm f / 3.9 lens compared to the Canon 70-200mm f / 4.0 L lens, which has a diameter of only about 27mm and somewhat limits the incoming light beam at an effective flange focal distance (a_eff) of 95mm. Furthermore, the inferior lens coatings of this older Soligor 85-208mm f / 3.9 lens, as well as age-related transmission losses, including those caused by dust inclusions and potential fungal growth, reduce the achievable illuminance.

[0092] The Fig. 5 represents a compact light source assembly, particularly well-suited for 85mm focal length lenses for 35mm full-frame SLR cameras, which can be flanged to the compact light source assembly as a projection lens. A long bayonet tube 9 features a fixed bayonet mount 6a on the front, designed as an F-mount for Nikon 35mm lenses. The long bayonet tube 9 is attached to the tube 7 by a screw connection (not shown in detail).

[0093] The nominal flange focal distance a_n is a_n = 46.5 mm. This corresponds to the flange focal distance specified by Nikon for F-mount lenses for 35mm full-frame SLR cameras. Due to a pre-set depth offset v of v = 43.5 mm on the compact light source assembly, the sum of the nominal flange focal distance a_n and the depth offset v results in an effective flange focal distance a_eff = 90 mm for an interchangeable lens (not shown here), which serves to sharply image the edge of the aperture blades 5b of the mechanical iris diaphragm 5a.

[0094] As can be demonstrated experimentally, with an effective flange focal distance of a_eff=90mm, a sharp image of the edge of a well-illuminated iris diaphragm 5a with aperture blades 5b, which open to a diameter D_F=20mm, can be achieved when a Zhongyi Creator 85mm f / 2.0 interchangeable lens with an F-mount and at full aperture is attached to the compact light source assembly. This interchangeable lens is set to the infinity position. This is achieved with a focal length distance z1, i.e., the depth of the LED 1 relative to the light-collecting lens 4, of z1=-1.3mm. The focal length distance z1 of z1=-1.3mm represents a slightly extrafocal position of the LED 1 at the light-collecting lens 4, as is also the case in the arrangement according to Fig. Figure 4. The free working distance from the lens mount to the object being photographed is then approximately 200 mm, and the approximate magnification is betaP_strich = 2:1. This allows – at full aperture of the Zhongyi Creator 85 mm f / 2 interchangeable lens – an illuminance of at least 160,000 lux to be achieved in a uniformly illuminated light field with a diameter of at least 40 mm and an electrical power of 23 W at the LED. It is evident that within the range of + / - 1.3 mm around the focal point F1, i.e., from z1 = -1.3 mm to z1 = +1.3 mm, there are no significant changes in achievable illuminance and field illumination.

[0095] If an achromatic close-up lens with 3 diopters is attached to the Zhongyi Creator 85mm f / 2.0 telephoto lens at an effective flange focal distance a_eff = 90mm and this telephoto lens is in the infinity position, the resulting magnification of the projection is betaP_strich = 1.15:1 at a focal point distance z1 = -1.3mm. 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.

[0096] In a first embodiment without a figure, with an effective support dimension a_eff of a_eff=90mm - and an otherwise identical setup as in the Fig. 5 - An extrafocal focal length distance z1 of z1 = -6 mm is now set. If a Zhongyi Creator 85 mm f / 2.0 camera lens (not shown here) with a Nikon F-mount and full aperture is attached to the compact light source assembly, the sharp image of LED1 at this extrafocal focal length distance z1 = -6 mm will be at least approximately in the area of ​​the rear lens element of this interchangeable lens. This interchangeable lens is then set to infinity. The rear lens element of this interchangeable lens has a diameter of approximately 28 mm. This rear lens element 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 46.5 mm as specified by the lens manufacturer.However, with this arrangement and 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 length difference z1 = -1.3 mm. A noticeable vignetting even occurs in the light field, so that an extrafocal focal point difference of z1 = -6 mm proves rather unsuitable here.

[0097] The Fig. 6 represents a compact light source assembly, especially for use with photographic lenses, i.e., interchangeable lenses for 35mm full-frame SLR cameras with a focal length between 50 and 85mm and, in exceptional cases, up to 135mm, in order to produce an evenly illuminated, bright, and sharply defined light field for macro photography or video recording. Here too, as in Fig. 1. The LED 1 of type getian-gt-fc40-5000k is used. This LED 1, with an approximately 6mm edge length of the luminous surface, is electrically operated in the same way as in Fig. 2. However, this LED 1 is positioned here at a focal point distance z1 of 4.8 mm intrafocal to the front focal plane FE1 of a light-collecting lens 4 with a focal length of 26 mm. The focal length fS1 of this lens 4 is 18 mm, which is measured from the planar surface of the light-collecting lens 4. Here too, as in Fig. 2 - The light-collecting lens 4 is surrounded by the aspherical, anti-reflective condenser lens ACL3026U-A, offered by Thorlabs. This light-collecting lens 4 acts as a collector, and a thinner field lens 11, which acts as a condenser, is positioned downstream of it. This thinner field lens 11 is the anti-reflective plano-convex lens LA1386-A from Thorlabs, which has a focal length of 75 mm. The antinodes of the two lenses face each other. Due to the intrafocal position of the LED 1 at the light-collecting lens 4, the field lens 11 now represents a virtual light object in the finite range. This virtual image B1'v of the LED 1 is located approximately twice the focal length f2 of the thinner field lens 11, and thus roughly 150 mm upstream.This results in at least an approximate 4f arrangement for the imaging of the virtual image of LED 1 by means of the field lens 11, which produces an approximately 1:1 imaging of this virtual image B1'v. Thus, the focal point distance z2' is approximately equal to the focal length f2. This field lens 11 concentrates the light from LED 1 downwards, thereby 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 at a distance from the planar surface of the field lens 11 that corresponds to the focal length s2' from the planar surface of the field lens 11 to the image plane BE1 of the image of LED 1.This focal length s2' only needs to be approximately set to 145 mm by adjusting the depth of field from the focal point distance z1. This is achieved by setting the LED 1 to an intrafocal position with a focal point distance z1 of 4.8 mm. The focal length fS2 of 70.1 mm is a manufacturer's specification from Thorlabs for the plano-convex lens LA1386-A, which is used here as the field lens 11. Increasing the focal length s2', which represents the image distance, from 145 mm by up to 35 mm or decreasing it by up to 25 mm has only a very minor effect on the uniformity of the illuminance in the field of field LF in the aperture plane E. The real image B1' is thus created from the virtual image B1'v of the LED 1 in front of the field lens 11, approximately with the magnification ratio of 1:1 after the field lens 11, i.e., downwards. The edge length of the approximately square image B2' is approximately 32.5 mm.This arrangement creates uniform illumination in the passage area of ​​the iris diaphragm 5a, which is opened here to a maximum diameter of 18 mm and is formed by the diaphragm blades 5b. This iris diaphragm 5a has a maximum diameter D_F of 23 mm. Its diaphragm blades 5b are arranged in the aperture plane E. However, the value for the focal point distance z1 of 4.8 mm can vary slightly to form the real image of the LED 1 at an approximate distance of 145 mm from the body of the field lens 11. This is due to variations between individual units of the light-collecting lens 4 and the field lens 11, as well as slight misalignments of these lenses and the design of the LED 1. Thus, distances between 120 mm and 180 mm from the field lens 11 can also occur for the real image B1' of the LED 1 without the illumination in the field generally changing significantly.The diameter of the light beam can be adjusted by means of the iris diaphragm 5a with its mechanically adjustable diameter D_F aperture blades 5b when a camera lens, which is interchangeable, is flanged to the compact light source assembly for projecting the illuminated field LF. The light passing through the iris diaphragm 5a enters the short bayonet tube 10, which is equipped with a front-mounted bayonet 6a. This bayonet 6a is a Canon EF bayonet mount for 35mm SLR cameras. The bayonet 6a is fixed to the short bayonet tube 10. 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. This arranged bayonet 6a is attached to the short bayonet tube 10.This bayonet mount 6a is designed to accommodate an older, widely produced EF lens (not shown here), the Canon EF 50mm f / 1.8, for 35mm SLR cameras. Unlike more modern versions of the Canon EF 50mm f / 1.8, this EF lens features manual focus. Manual focus is a significant advantage when a sharply defined light field is required for macro photography, or when a degree of blurring around the edges of the light field is desired for artistic purposes. In such cases, manual focus is highly beneficial. The aperture 5a, with its aperture plane E, is located 21.5mm from point PA, representing a depth offset v. This results in a significant depth offset v to the mounting surface A of bayonet mount 6a, to which the interchangeable lens (not shown here) can be attached.This results in an effective flange focal distance a_eff of a_eff = 65.5 mm for the interchangeable lens (not shown here), which is the sum of the nominal flange focal distance a_n of 44 mm and the depth offset v of 21.5 mm. The interchangeable lens (not shown here) serves to sharply image the edge of the aperture blades 5b of the iris diaphragm 5a, as a sharp edge is usually advantageous for illumination in macro photography. When this older interchangeable lens, a Canon EF 50mm f / 1.8 for 35mm format, is focused 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 obtained at a small distance from its lens mount, which in this case is approximately 110 mm. The illuminance in the light field is then at least 220,000 lux with an electrical power of 23W at the LED 1 of type getian-gt-fc40-5000k.A free distance of 110 mm from the lens mount to the sharply focused light field is often a suitable value for object illumination in macro photography or macro video recording. This increases the set diameter D_F of the iris diaphragm 5a by a factor of 1.95, resulting in a magnification ratio of 1.95:1 for the projection betaP_strich.Interchangeable lenses from other manufacturers with a 50mm or 55mm focal length – especially those with an M42 lens mount – can also be used to advantage here via an adapter to the Canon EF mount. Even 50mm or 55mm lenses with apertures of f / 1.7 or f / 1.4 offer a slight increase in illumination, but – due to the optical design – this increase is significantly less than one would expect from the ratio of the illumination intensities. This is because, with interchangeable lenses at their highest aperture (up to f / 1.2), the entrance pupils are not fully illuminated by the incoming light beam, according to the manufacturer's design.This arrangement is therefore particularly optimized for a compact light source assembly for photographic lenses with approximately 50mm to 60mm focal length and apertures of 1:1.8, since these lenses were produced millions of times worldwide and are still widely available and can also be obtained quite cheaply from second-shop dealers.

[0098] The arrangement for a compact light source assembly according to Fig. The Tamron 60mm f / 2 macro lens is also well-suited for use with this lens, as it has a comparatively large rear element with a diameter of at least 26mm, which serves as the entrance lens. With a projection scale 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 with the Tamron 60mm f / 2 macro lens for the intrafocal position of LED 1 at a focal point distance z1 of 4.8mm, with an illuminance of at least 240,000 lux in the light field. Illuminance values ​​approximately 10% higher at the center of the light field are obtained with a focal point 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 for a very high degree of flexibility for the macro photographer when illuminating a subject. The imaging situation with this compact light source assembly... Fig. 6, which creates the real image of the LED 1 at an approximate distance of 145mm from the underside of the 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.

[0099] If, on the other hand, the longer focal length, manual interchangeable lens Zhongyi Creator 85mm f / 2.0 is attached to the compact light source assembly after Fig. When a 6mm lens is used and this interchangeable lens is focused on close-up subjects, 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 approximately 130,000 lux. The distance to the light field is then around 290mm. Therefore, 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.

[0100] When the Zhongyi Creator f / 2.0 camera lens with a focal length of 85mm, focused for close-up photography, is used here at an effective flange focal distance a_eff of 65.5mm, and an achromatic close-up 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 the LED 1 type getian-gt-fc40-5000k. The free working distance to the light field is then approximately 115mm, and the magnification for the projection betaP_strich is approximately 1.26:1, which leads to a slightly enlarged light field as an image of the transmission area of ​​the iris diaphragm 5a.

[0101] When the Zhongyi Creator 135mm f / 2.8 camera lens, focused for close-up photography, is used here with an effective flange focal distance (a_eff) of 65.5mm, and an achromatic close-up lens with a refractive power of 5 diopters is attached to this interchangeable lens, the resulting illuminance in the light field is at least 500,000 lux with an electrical power of 23W at the LED 1 (type getian-gt-fc40-5000k). The free working distance is approximately 155mm, and the magnification ratio for the projection (betaP_strich) is approximately 1:1, resulting in a light field of the same size as the image of the transmission area of ​​the iris diaphragm (5a), i.e., the illuminated field (LF).

[0102] The compact light source assembly according to Fig. 7 corresponds to the Fig. 6 with the additional arrangement of an extension ring 13 of width 12 mm, 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. This 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 Zhongyi Creator 85mm f / 2.0 with a Canon EF mount, set to the close focusing distance of 0.85m, is attached to the extension tube 13 at an effective flange focal distance of a_eff=78mm, the resulting magnification ratio of betaP_strich is approximately 2.0:1 at a working distance of approximately 200mm. The achievable illuminance in the light field is then at least 220,000 lux. Reducing the focal point distance z1 from 4.8 mm to as low as 2.5 mm results in only a slight variation in the achievable illuminance, and the illumination of the light field remains consistently good when the diameter D_F of the illuminated field LF in the aperture plane E is a maximum of 20 mm. This applies to the Zhongyi Creator 85 mm f / 2 interchangeable lens.If, on the other hand, 0 is focused at infinity, a free working distance of approximately 280mm results, so that the focusing option on this interchangeable lens gives the user a comparatively large degree of flexibility in object illumination.

[0103] In a second embodiment without its own figure according to Fig. 7 is a complete set of extension rings from the company Quenox 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.

[0104] The compact light source assembly according to Fig. 8 largely corresponds to that of the Fig. 7, however, a lens mount 6b for an interchangeable lens with an M42x1 screw thread is arranged on the short bayonet tube 10, and the effective flange focal distance a_eff is changed. The M42x1 threaded mount is a lens mount for interchangeable lenses using a screw thread. This allows interchangeable lenses with an M42x1 thread, which have been manufactured in the millions since the 1960s, particularly in Japan, and are still widely available among photographers or in second-hand shops, to be attached. The nominal flange focal distance a_n for the M42x1 threaded mount is a_n = 45.46 mm. The depth offset v formed by the short bayonet tube 10 is calculated to be 20.04 mm in order to achieve an effective flange focal distance a_eff of a_eff = 65.5 mm. The Auto Revuenon 55mm f / 1.7 photo lens can be advantageously attached here to obtain a bright and evenly illuminated light field for macro photography.This lens has a lens mount diameter of at least 23 mm. When this camera lens is focused for close-up photography, with an effective flange focal distance (a_eff) of 65.5 mm, a working distance of 130 mm is achieved. The magnification for the projection (betaP_strich) is then approximately 2.2:1, and an illuminance of approximately at least 220,000 lux can be achieved in the light field if the focal point separation (z1) in the arrangement shown in the figure is 4.8 mm. This value may vary slightly from setup to setup. If, however, the focal point separation (z1) is set to 2 mm, an illuminance of approximately at least 240,000 lux can be achieved at the center of the projected light field, albeit with significant vignetting. This can be advantageous in specific shooting situations when illuminating objects.However, the magnitude of the projection scale for betaP_strich remains unchanged at 2.2:1.

[0105] Other camera lenses with an M42x1 thread and, for example, a 50mm focal length, can also be used here to advantage. However, a 50mm lens will generally result in a slightly shorter working distance for the same magnification (betaP_strich) compared to common 55mm lenses. This also depends, of course, 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. With apertures larger than f / 1.7, older, common camera lenses, such as the older Auto Revuenon 55mm f / 1.4, generally no longer offer a noticeable advantage in terms of achievable illumination in the projected light field. This is because, with a larger aperture like f / 1.4, the rear element of the camera lens (e.g., 29mm in diameter) is no longer fully illuminated by a light beam entering the rear element with a diameter of approximately 25mm.

[0106] The Fig. Figure 9 shows a compact light source assembly, the left part of which, up to the iris diaphragm 5a, is arranged according to Fig. This compact light source assembly is designed for mounting the Rodagon 50mm f / 2.8 reprographic lens from Rodenstock. This reprographic lens, which is also an interchangeable lens, has a flange dimension of 43.5mm according to the manufacturer. A depth offset v of v=34.5mm, set here with a bellows focusing device 8, results in an effective flange focal distance a_eff of a_eff=78mm. The device is attached via the threaded connection 6c, which is located on the front of the bellows focusing device 8 and is designed for a reproduction lens with an M39×1 / 26" thread. The attachment of the bellows focusing device 8 to the tube 7 is not shown here. This results in a free distance of approximately 120 mm between the reproduction lens and the light field, and the illuminance in the light field exceeds 100,000 lux at an electrical power of 23 W at the getian-gt-fc40 LED 1.This results in a 1.7-fold increase in the light field compared to the diameter D_F of the illuminated field LF in the aperture plane E. The use of a bellows focusing device 8 is particularly advantageous when the interchangeable lens – such as the repro lens in this case – has no focusing capability of its own and a wide range of distances to the light field is desired.

[0107] In the Fig. Figure 10 is an arrangement for a compact light source assembly for mounting camera lenses with a lens mount 6a for an interchangeable lens via a bayonet mount. This lens mount 6a is a Nikon F-mount, which has a flange focal distance a_n of 46.5 mm according to the manufacturer. The effective flange focal distance a_eff = 78 mm is achieved here due to the depth offset v = 31.5 mm, which is determined by the setting of the bellows focusing device 7. The attachment of the bellows focusing device 8 to the tube 7 is not shown here. If an interchangeable lens Zhongyi Creator 135 mm f / 2.8 is set to its close focusing distance of 1.5 m and flanged to the Nikon F-mount, with an effective flange focal distance a_eff = 78 mm, the resulting free distance from this interchangeable lens to the light field is approximately 490 mm.For a focal point distance z1 of 4.8 mm, uniform field illumination is achieved within a 60 mm diameter light field, provided the iris diaphragm has a diameter D_F of 20 mm for the illuminated field LF in the aperture plane E. The magnification 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 getian-gt-fc40 LED 1. However, the bellows focusing device 8 also allows for 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 reproduction ratio betaP_strich of 1.05:1 can be achieved, resulting in 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 at LED 1 of type getian-gt-fc40. With a flanged interchangeable lens with a focal length of 135 mm, the quality of the illumination of the light field varies significantly less depending on the setting of the focal point distance z1 than with lenses with a focal length of 50 mm.

[0108] The Fig. Figure 11, which is not to scale, features a light-collecting lens 4 with a focal length f1=26mm and a field lens 11 with a focal length of f2=75mm in an arrangement for a compact light source assembly. Fig. Figure 11 shows an arrangement for a compact light source assembly for mounting an interchangeable lens from the photographic field of view, which has a bayonet mount, to the lens mount 6a. This lens mount 6a is a Canon EF bayonet, which has a flange focal distance a_n of 44 mm according to the manufacturer's specifications. Thus, with a depth offset v of 42 mm, the effective flange focal distance a_eff is a_eff = 86 mm. The set focal point distance z1 is approximately z1 = 4.8 mm at a focal length f2 of 75 mm. This focal point distance z1 of 4.8 mm creates a magnified virtual image B1'v of the LED 1, which acts as a light object for the downstream field lens 11 and has an edge length of 32.5 mm. This virtual image B1'v is imaged by the field lens 11 at approximately the magnification ratio of 1:1.Thus, with a focal length s2' of approximately 145 mm, measured from the planar surface of the field lens 11, a real image B1' of the LED 1 is formed in the image plane BE1 with an edge length of approximately 32.5 mm. The beam extent in the area of ​​the lens mount 6a for an interchangeable lens with a bayonet mount is therefore significantly smaller than the edge length of 32.5 mm. With this design of a compact light source assembly, the attachment of a Canon 70-200 mm f / 4.0 L telephoto zoom lens to the lens mount 6a is very advantageous for generating a sharply focused light field at an adjustable free distance of 100 mm to 600 mm. 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 overexposed by the incoming light beam, which represents good optical matching.When using different zoom focal lengths on the aforementioned telephoto zoom lens, the magnification of the light field changes relatively little, but the position of the sharply focused light field, and thus the distance to the subject, changes significantly. For example, at a zoom focal length of 70mm, the distance between the telephoto zoom lens and the light field, which can be considered a usable working distance for macro photography, is approximately 100mm. This results in an illuminance of at least 140,000 lux within the light field, with a magnification of 1.65:1 and an electrical power consumption of 23W at the getian-gt-fc40 LED. 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, on the other hand, a zoom focal length of 200mm is set, the close-up setting 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 at a magnification of 2.2:1. The diameter of the light field is 51mm when 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 type mentioned. Therefore, in the depth range from 100mm to 600mm, with an effective flange focal distance of a_eff=86mm, a sharply focused light field can be achieved at every depth position via the zoom focal length of this telephoto zoom interchangeable lens without significant changes in the illuminance or the magnification.This allows photographers who want to take macro photographs of small objects, such as those in the wild and therefore at varying distances from their camera, to work effectively. This minimal change in magnification over such a large distance is not achievable with a typical macro lens, for example, with a focal length in the 60mm to 105mm range. However, when using a typical telephoto zoom lens – with a focal length range of 70mm to 200mm and an aperture of f / 4 – one must accept the lower illuminance in the projected light field compared to a normal lens or a macro lens with a faster aperture. This is despite the fact that the diameter of the rear element, which acts as the entrance lens, is at least 30mm in this telephoto zoom lens.This is where the rather low aperture of 1:4 of the telephoto zoom lens becomes noticeable in comparison to a normal lens with, for example, an aperture of 1:1.8 or a macro lens with an aperture of 1:2 or 1:2.8.

[0109] In the arrangement according to Fig. Figure 12, which is not to scale, shows a flange focal distance a_n of 46.5 mm in the arrangement for a compact light source assembly, which is the flange focal distance of lenses with a Nikon F bayonet mount. 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. The device 12 further comprises a light-collecting lens 4 with a focal length f1 = 26 mm and a field lens 11 with a focal length f2 = 100 mm. The focal distance z1 from the light-collecting lens 4 is set to approximately 3.3 mm. 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 47.3 mm, is imaged by the field lens 11 at a magnification of approximately 1:1. The real image B1' of the LED1 is thus formed at a focal length s2' of approximately 200 mm and has an edge length of approximately 47 mm.

[0110] As previously described, there is an effective flange focal distance of a_eff = 100 mm, without going into the details of its technical implementation here. The lens mount 6a is designed for an interchangeable lens with a Nikon F-type bayonet mount. When a Zhongyi Creator 85mm f / 2.0 interchangeable lens with a Nikon F-type bayonet mount is attached to this lens mount 6a and focused at infinity, the working distance to the sharply focused light field is 160 mm. This results in a magnification ratio of approximately 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 on the close range, the free working distance to the sharply focused light field is approximately 140mm and the light intensity in the center of the light field is approximately 340,000Lux.

[0111] However, even with a field lens 11 with a focal length of f2=100mm, attaching a Canon 70-200mm f / 4.0 L telephoto zoom lens to the lens mount 6a is very advantageous for macro photography, as it allows for the creation of a sharply focused light field. This light field can then be adjusted at any distance from this telephoto zoom lens, from 100mm to 600mm, by varying the zoom focal length, thus opening up great creative possibilities for macro photography.

[0112] In Fig. Figure 13, which is not to scale, shows a flange focal distance a_n of 17.7 mm in the arrangement for a compact light source assembly, which is the flange focal distance of interchangeable lenses with a Fujifilm X-type bayonet mount. 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. The field lens 11, with a focal length of only 50 mm (f2), is supplied by Thorlabs and is type LA1385-A. This short focal length of 50 mm is advantageous for interchangeable lenses when the diameter of the entrance lens used here—referring to the "rear lens" of the camera lens in photographic terminology—is only about 15 to 20 mm or even smaller, and these interchangeable lenses have a relatively short focal length. This is because the cross-section of the incoming light beam is reduced by the comparatively short focal length of 50 mm field lens compared to using a longer focal length field lens. Smaller rear lenses are primarily found in zoom lenses in the short telephoto range and also in lenses with an aperture of f / 2.8 and smaller in the focal length range of 35 to 60 mm. The focal distance z1 from the light-collecting lens 4 is set to approximately 6.5 mm.The position of LED1 is therefore intrafocal. The real image B1' is the image of the virtual image B1'v, the latter having an edge length of approximately 24 mm. The virtual image B1'v is imaged by the field lens 11 at a magnification of 1:1. The real image B1' of LED1 is thus formed at a focal length s2' of approximately 93 mm and has an edge length of approximately 24 mm.

[0113] In this case, with a field lens 11 with a focal length of 50mm, the use of a 135mm camera lens with an aperture of f / 2.8 is no longer necessarily recommended if a comparatively small light field is to be projected. There may then be a mismatch between the size of the incident light beam for imaging the LED 1 and the diameter of the entrance lens of this camera lens.

[0114] The relatively short focal length interchangeable lenses from the Chinese manufacturer 7Artisans can also be used to advantage here, for example, the 55mm f / 1.4 and 50mm f / 1.8 lenses, the latter having a rear element diameter of approximately only 17mm, as well as the 60mm f / 2.8 macro lens, all of which are designed for the APS-C format. These interchangeable lenses use the Fujifilm X mount and therefore each have a nominal flange focal distance (a_n) of 17.7mm.

[0115] For the interchangeable lens from the Chinese manufacturer 7Artisans, set to close-up focus and an aperture of f / 1.4, for the APS-C format, which has a rear element with a diameter of approximately 20mm (used here as the entrance element), a remarkably high illuminance of at least 400,000 lux is achieved at the center of the light field when the lens mount is 100mm away from the projected light field (not shown here). This illuminance decreases only by a few percent towards 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 about 24mm.The current across the aforementioned LED 1, type getian-gt-fc40, is approximately 2A, and the voltage is 11.6V. When this interchangeable lens is set to infinity, a free distance of 130mm from the lens mount to the projected light field (not shown here) results in an illuminance of at least 300,000 lux at the center of the light field. The magnification is then approximately 2:1. With this interchangeable lens, the field diaphragm can even be set to a diameter D_F of 23mm without any noticeable drop in illuminance towards the edge of the light field. Thus, this 55mm f / 1.4 interchangeable lens from the Chinese manufacturer 7 Artisans, designed for APS-C format, is particularly well-suited for use with the camera shown here. Fig. The compact light source assembly described in section 13 is also used. However, even with the inexpensive interchangeable lens from the Chinese manufacturer 7Artisans, a 50mm f / 1.8 lens for APS-C format, which has a rear lens element with a diameter of approximately only 17mm, an illuminance of at least 200,000 lux can still be achieved at close focusing distances of 130mm and a magnification ratio of approximately 1.5. This is perfectly adequate for many lighting situations in macro photography.

[0116] In the Fig. In the arrangement for a compact light source assembly, the lens connection 6d is a C-mount threaded connection according to the standard ANSI / SMPTE 76-1996 1-32 UN 2A, and the illumination field lens 11 also has a focal length f2 of 50 mm. This is advantageous for video lenses when the diameter of the entrance lens – meaning the "rear lens" of the video lens – is only about 15 mm or even smaller. The depth offset v of 8.8 mm, combined with the flange focal distance of 17.526 mm according to a C-mount connection, results in an approximate effective flange focal distance a_eff of a_eff = 26.3 mm.

[0117] Here too - as in the arrangement according Fig. 13 - The focal point distance z1 from the light-collecting 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 edge length of approximately 24 mm and is imaged by the field lens 11 with a magnification of approximately 1:1. The real image B1' of the LED1 is thus formed at a focal length s2' of approximately 93 mm and with an edge length of approximately 24 mm.

[0118] Used as a projection lens for the iris diaphragm 5a on the arrangement for a compact light source assembly according to Fig. 14. Now, for example, if the cost-effective Fujian video lens with specifications of 35mm and f / 1.6, a rear lens diameter of approximately 15mm, and 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 at the center of the light field, and this with a magnification of approximately 3:1. The projected light field has a diameter of 48mm, since the diameter D_F of the illuminated field is set to 16mm. In the infinity position, with a free distance of 160mm, the illuminance is then at least 100,000 lux at the center of the light field, and this with a magnification of approximately 4:1. The projected light field has a diameter of 64mm, since the diameter D_F of the illuminated field is set to 16mm.Therefore, this inexpensive 35mm f / 1.6 video lens from Fujian, despite its relatively short focal length of only 35mm, is still quite suitable for macro lighting. However, a cost-effective 50mm f / 1.4 video lens can also be used to project the light field, allowing for greater distances during projection.

[0119] In a third embodiment without its own figure drawing, but based on the arrangement according to Fig. Component 14 also features a C-mount threaded connection with a nominal flange focal distance of 17.526 mm on the compact light source assembly. The Thorlabs field lens 11 also has a focal length f2 of 50 mm, while the light-collecting lens has a focal length f1 of 26 mm. However, a set depth offset v of 16.7 mm, 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, a small, inexpensive 50 mm f / 1.4 interchangeable TV lens, is attached to the compact light source assembly, a light field with a magnification ratio betaP_strich of approximately 2:1 can be projected at a free distance of 125 mm.The diameter of the well-illuminated and sharply defined light field is then 28mm, and the achievable illuminance at the center of the light field is at least 200,000 lux. However, the rear lens of the TV interchangeable lens with specifications of 50mm f / 1.4, which is used here as the entrance lens, is slightly overexposed, so the optical alignment is not quite optimal.

[0120] In a fourth embodiment without its own figure drawing, but based on the arrangement according to Fig. In Figure 14, the lens connection is designed as a CS-mount threaded connection with a flange focal distance of 12.5 mm, thus allowing lenses with a focal length of, for example, only 16 mm to be used for close-range illumination with a free working distance of only 40 mm. In a fifth embodiment, without its own drawing, a field lens 11 with a focal length f2 of 40 mm is used in the compact light source assembly, while the light-collecting lens has a focal length f1 of 26 mm. The focal point 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, results here, as in the fourth embodiment (without its own drawing), in an effective flange focal distance a_eff of approximately a_eff = 34.2 mm.If a TV interchangeable lens with the specifications 50mm f / 1.4 is attached to the compact light source assembly, the rear lens of the TV interchangeable lens with the specifications 50mm f / 1.4, which is used here as the entrance lens, is not overexposed, so that the photometric matching is optimal.

[0121] In the Fig. Figure 15 shows how the compact light source assembly can also be controlled wirelessly by the photographer using a radio wave receiver 15 and a radio wave transmitter 16, the latter being part of a smartphone with a touch-sensitive display 17. Furthermore, the light source 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. The focus here is on setting the operating current for the LED 1 and the diameter D_F of the diaphragm elements of the motorized field diaphragm 5c. The operation of the lighting arrangement, and thus the setting of the aforementioned parameters, is carried out via the touch-sensitive display 17.The touch-sensitive display 17 of the same shows two sliders symbolically. These are used to control the operating current of the LED 1 and the mean diameter D_F of the opening formed by the aperture blades 5b of the motorized field diaphragm 5c.

[0122] In the Fig. Figure 16 shows a compact light source assembly in which a remotely controllable liquid aperture 5d is integrated, which is operated with the liquid 19. This liquid aperture 5d can also be controlled wirelessly by the photographer using a radio wave receiver 15a and a radio wave transmitter 16, the latter being part of a smartphone with a touch-sensitive display 17.

[0123] In the Fig.Figure 17 shows a compact light source assembly in which an electrically controllable liquid lens 11a is integrated, positioned downstream of the iris diaphragm 5a. The liquid lens 11a is integrated into the lens connection 6. The achievable refractive power of this liquid lens 11a ranges from 7 diopters to 10 diopters. Thus, by varying the refractive power of this liquid lens 11a, the distance of the projected light field can be significantly changed when an interchangeable lens is attached to the compact light source assembly for projection, and the liquid lens 11a is positioned directly in front of the entrance lens of the interchangeable lens (not shown). In this case, the entrance lens of the interchangeable lens acts as its rear lens during standard use, since this interchangeable lens is used for projection.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 power controllers 3. Accumulator for electrically powering the LED 1 4 light-collecting lenses 5 Light field aperture 5a Mechanical iris diaphragm as a special design of the illuminated field diaphragm 5 5b Aperture blades 5c Electrically controllable, motorized iris diaphragm as a special design of the illuminated field diaphragm 5 5d electrically controllable liquid aperture as a special design of the luminous field aperture 5 6. Lens mount in the design for a camera (nut piece) for attaching an interchangeable lens with a mounting surface A. This can be a bayonet, a plug-in or a threaded connection. 6a Lens mount for an interchangeable lens with a bayonet mount. The bayonet mount can be located on a camera body, a lens barrel, an extension tube, or a bellows focusing device. In any case, this bayonet mount is the counterpart to the bayonet mount of an interchangeable lens and corresponds to a camera-side bayonet mount. 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 adjustment device 9 long bayonet tube 10 short bayonet tube 11 Illuminating field lens, which is arranged in front of the luminous field LF 11a Electrically controlled liquid lens 12 Condenser group 13 Intermediate ring 14 Group of intermediate rings 15 Radio wave receiver unit for remote control of the motorized iris diaphragm 5c and the current controller 2 15a Radio wave receiver unit for remote control of the electrically controlled liquid orifice 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 controlled liquid orifice 5d A Mounting surface for an interchangeable lens The lens shoulder of a commercially available interchangeable lens for projecting the luminous field LF is flanged to the mounting surface A. AZ mounting surface for an interchangeable lens on an extension ring 13 d1 Distance of the aperture plane E from the planar surface of the light-collecting lens 4 d2 Distance of the aperture plane E from the planar surface of the illuminating field lens 11 a_eff effective flange focal distance. The effective flange focal distance a_eff is measured upwards from the mounting surface of the lens mount 6, 6a, 6b, 6c, 6d to the aperture plane E. For an extension tube, the nominal flange focal distance a_n is measured 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 measured light-up from the mounting surface A of the lens mount 6, 6a, 6b, 6c, 6d to point PA. For an extension tube, the nominal flange focal distance a_n is measured 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 light direction to the sensor chip or film plane according to the manufacturer's specification 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 specification, is always significantly smaller than 1:1, for example 1:4 to 1:9. betaP_strich: Magnitude of the image scale of an interchangeable lens for imaging the luminous field LF. The magnification betaP_strich represents the reciprocal of the magnification beta_strich specified by manufacturers of interchangeable lenses for film or sensor imaging. The maximum magnification betaP_strich of a standard interchangeable lens used here for projection is significantly larger than 1:1, for example, 3:1. d1 Distance of the planar surface of the light-collecting lens 4 from the plane E d2 Distance of the planar 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 controlled liquid aperture 5d f1 Focal length of the light-collecting lens 4 F1 front focal point of the light-collecting lens 4 f2 Focal length of the illuminating field lens 11 FE1 front focal plane FE1 of the light-collecting lens 4 fS1 focal length of the light-collecting 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 point PL. This can be achieved by imaging using the light-collecting lens 4 or by imaging using both the light-collecting lens 4 and the illuminating field lens 11. PL'v virtual image point of point PL solely by imaging using the light-collecting lens 4 s1' Cutting distance from the curved surface of the light-collecting lens 4 to the image plane BE1 of the image of the LED1 s2' Cutting distance from the flat surface of the luminous field lens 11 to the image plane BE1 of the image of the LED1 v Depth offset, always referred to a lens connection 6, 6a, 6b, 6c or 6d in the design for a camera (matrix 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 illuminated 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 is the signed focal point distance of the LED 1 from the front focal plane FE1 of the light-collecting lens 4. This signed focal point distance z1 is - according to the widely applied sign rule - positive in geometric optics for an intrafocal position of the LED 1 and negative for an extrafocal position of the LED 1.

Claims

[1] Compact light source assembly for a lighting arrangement, especially also for macro photography or for close-up moving image 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 light source assembly with a flat mounting surface (A, AZ) is designed as part of a lens connection (6, 6a, 6b, 6c, 6d) or an extension 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 commercial lens manufacturer for this lens mount (6, 6a, 6b, 6c, 6d). and the support surface (A, AZ) is spaced from the aperture plane (E) of the field aperture (5) by an effective flange focal distance (a_eff) downwards by mechanical means and this effective support dimension (a_eff) results from the addition of the nominal support dimension (a_n) and a predetermined depth offset (v) and the depth offset (v) 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 commercial lens manufacturer is and the focal length (f1) of the light-collecting 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) 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 (6, 6a, 6b, 6c, 6d) as specified by the commercial lens manufacturer. and A field lens (11) with focal length (f2) is arranged downstream of the light-collecting lens (4) and the field lens (11) is arranged in front of the field of light (LF). [2] Compact light source assembly for a lighting arrangement according to claim 1, characterized in that, in the case of a lens connection (6, 6a, 6b, 6c, 6d) in the design for a mirrorless camera on the compact light source assembly, the depth offset (v) 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 light source assembly for a lighting arrangement according to claim 1, characterized in that, in the case of a lens connection (6, 6a, 6b, 6c, 6d) of the design 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 connection (6, 6a, 6b, 6c, 6d) specified by the manufacturer. [4] Compact light source 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 10mm and 40mm and its numerical aperture is between 0.4 and 0.

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

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