Camera adapter

Abstract

A camera adapter (12) for use in the converging beam path of a microscope includes an object-side connector (13), an image-side connector (14), and multiple lenses (L... i ), of which the lens (L i The lenses (L) are arranged in at least two groups (G1, G2), wherein the lens (L) i The first group (G1) has positive refractive power, and the lens (L) in it has positive refractive power. i The second group (G2) has negative refractive power.

Description

[0001] This patent application claims priority to German patent application 10 2025 105 159.3, the contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to a camera adapter. It also relates to a camera system having such an adapter. Finally, this invention relates to a microscope having such a camera adapter. Background Technology

[0003] Typically, an adapter is required to connect the camera to the microscope. In this case, beam path vignetting may occur due to the limited diameter, especially with regard to the camera-side connector of such an adapter.

[0004] For example, a camera adapter is known from DE 10 2009 010 448 B4. However, this camera adapter is designed to be arranged in a parallel beam path. Summary of the Invention

[0005] The problem solved by this invention is to improve the camera adapter for microscopes.

[0006] This problem is solved by the adapter according to the present invention.

[0007] According to one aspect, the adapter is designed to be positioned within the converging beam path of the microscope. Specifically, it can be positioned within the beam path downstream of the microscope tube lens.

[0008] The camera adapter according to the invention can be used in particular to image intermediate images, especially corrected intermediate images, onto a camera sensor.

[0009] Specifically, this can be a camera adapter for wide-field microscopes. The adapter according to the invention is particularly suitable for imaging fields of view with diameters in the range of 20 mm to 25 mm, especially those with a diameter of at least 23 mm. The diameter of the field of view corresponds to the diameter of the object field multiplied by the magnification of the objective lens.

[0010] A connector, also known as an interface, can specifically include interfaces, particularly mechanical interfaces. Interfaces can also include electrical interfaces. In particular, interfaces can include one or more devices for transmitting data and / or energy.

[0011] Side connectors, in particular, can be standardized.

[0012] Image-side connectors are especially used for connecting cameras.

[0013] In particular, side connectors can include threaded or bayonet connectors.

[0014] This makes it easy to connect a camera.

[0015] According to one aspect, the paraxial magnification of the adapter can be in the range of 0.5 to 0.8, particularly in the range of 0.6 to 0.7, and especially in the range of 0.63 to 0.65.

[0016] Currently, there are no camera adapters with magnification in the range of 0.5 to 0.8, and especially in the range of 0.62 to 0.65, and image-side connectors with a net diameter not exceeding 21 mm, which can transmit the full optical extension of a field of view with a diameter exceeding 20 mm, especially at least 23 mm, and especially at least 25 mm to the camera sensor. Currently, there are also no camera sensors with a diagonal exceeding 11 mm, especially 16 mm.

[0017] It has been found that the adapter of the present invention allows for low-loss imaging, and particularly non-destructive imaging, of an image field onto a typical camera sensor. In particular, at least 90% of the total optical extension of the microscope mount, especially the total optical extension, can be imaged onto the sensor of the provided camera.

[0018] The product of the transmitted field of view and the image-side numerical aperture is called the optical spread.

[0019] Cameras require a very large number of pixels in order to capture the maximum possible proportion of information in the image field. The required number of pixels depends on the optical spread.

[0020] However, pixel size is also crucial for the dynamic range of camera images. Larger pixels offer a decisive advantage under adverse lighting conditions or in low-light environments. Therefore, for low-light applications in wide-field microscopy, such as fluorescence microscopy, it is desirable to image the entire optical expansion of the support or objective onto a camera with the largest possible number of pixels, i.e., onto a camera with the largest possible sensor. Specifically, the camera sensor can be in a 2 / 3” format (11 mm diagonal) or a 1” format (16 mm diagonal). In this case, the inch specification corresponds to the standard specifications for CCD and CMOS sensors. A sensor whose photosensitive area corresponds to a 1-inch barrel (1” barrel) is referred to herein as a 1-inch sensor. Smaller chips typically cannot receive the entire optical expansion, and certainly not in the case of adapters with paraxial magnification within a specified range.

[0021] In particular, an adapter with a magnification of V=0.64 is required to image a field of view with a diameter of 25 mm onto a sensor with a diagonal of 16 mm.

[0022] On the other hand, the side connector is in the form of a C-mount connector. Specifically, the connector can have a 1-inch male thread.

[0023] The connector can have a flange focal length of 17.526 mm. The flange focal length refers to the distance from the shoulder of the adapter to the image plane.

[0024] According to one aspect, the camera adapter includes multiple lenses arranged in two groups along the beam path from the object field to the image field.

[0025] In this context, a lens group refers to one or more lenses that share a common mounting. If a group contains multiple lenses, they are typically cemented together. However, several lenses in a group can also be non-cemented.

[0026] In particular, the lens assembly may include, or may be composed of, a cemented member having two or more lenses cemented together.

[0027] According to one aspect, the lens L of the first group G1 in the adapter... i The focal length can range from 50 mm to 200 mm, especially from 100 mm to 150 mm.

[0028] Specifically, the lens L of the first group G1 in the adapter i It can have positive refractive power. This allows the principal ray of the beam from the object field to be redirected in the direction of the optical axis. Therefore, the beam diameter can be reduced. This allows the entire beam to be guided through the image-side connector of the camera adapter without being blocked.

[0029] Specifically, the first group may include a lens with a diameter larger than the net inner diameter of the image-side connector.

[0030] In particular, the first lens group can be designed such that it causes the beam path to be focused, so that the beam path is guided through the image-side connector in a substantially unobstructed manner, especially in a completely unobstructed manner.

[0031] In particular, the vignetting effect of the beam path is less than 20% of the field of view diameter, especially not more than 10% of the field of view diameter, and especially not more than 5% of the field of view diameter.

[0032] On the other hand, the object-side connector can have a larger net inner diameter d than the image-side connector. O The internal net diameter d of the object-side connector O With the image-side connector's internal net diameter d B The ratio can be at least 1.1, and in particular at least 1.2.

[0033] The first group of lenses may in particular include positive lenses, that is, lenses with positive refractive power. In particular, the first group may be composed of such positive lenses.

[0034] In particular, the positive lens can be made of crown glass. In particular, the positive lens can be made of a material with an Abbe number ve of at least ve greater than or equal to 55, and especially ve greater than or equal to 75.

[0035] This allows for particularly good correction of longitudinal and / or lateral color differences.

[0036] In particular, the positive lens can be made of a material with a refractive index of at least 1.5.

[0037] In particular, positive lenses can have a focal length of no more than 150 mm, especially no more than 135 mm.

[0038] According to another aspect, the lenses in the second group can have a focal length in the range of -350 mm to -50 mm. The second group may particularly include negative lenses, i.e., lenses with negative refractive power. Specifically, the focal length of the negative lenses can be in the range of -150 mm to -350 mm, particularly in the range of -250 mm to -300 mm. The negative lenses can particularly be in the form of meniscus lenses, especially in the form of thick meniscus lenses. Specifically, the negative lenses can have a thickness of at least 3 mm, particularly at least 3.5 mm, and particularly at least 4 mm.

[0039] According to one aspect, the second lens group G2 may have a total thickness of at least 8 mm, particularly at least 10 mm, particularly at least 10.5 mm. The total thickness should be understood as the sum of the thicknesses of lenses L2 and L3 of the cemented doublet in the optical axis region.

[0040] The second group can also be a combination of positive and negative lenses. In particular, the second group can include cemented components with positive and negative lenses, especially cemented doublet lenses.

[0041] This allows for particularly good correction of color differences, especially longitudinal and / or lateral color differences.

[0042] In particular, the positive lenses in the second group can be made of crown glass. Specifically, the positive lenses in the second group can be made of a material with an Abbe number ve greater than or equal to 50, and especially ve greater than or equal to 60.

[0043] Specifically, the negative lenses in the second group can be made of flint glass. Specifically, the negative lenses in the second group can be made of a material with an Abbe number of 35 ≤ ve ≤ 55, particularly 35 ≤ ve ≤ 45.

[0044] In particular, the Abbe numbers of the two lenses in the second group can differ from each other by at least 15, especially at least 20, especially at least 24, especially at least 25.

[0045] According to another perspective, the refractive indices of the positive and negative lenses in the second set of cemented doublet lenses can be only slightly different, especially for the dominant wavelength, particularly for the e-line λ=546nm.

[0046] In particular, the result avoids monochromatic imaging aberrations at the glued surface.

[0047] For the refractive indices ne2 and ne1 of the materials of the two lenses in the cemented component of the second lens group, in particular Especially And especially Applicable.

[0048] According to another aspect, the second lens group includes a positive lens and a negative lens, wherein the materials of the two lenses have a refractive index of at least 1.55, and in particular at least 1.58.

[0049] The refractive index may be particularly not greater than 1.7, particularly not greater than 1.64, and particularly not greater than 1.62.

[0050] Using materials with high refractive indices allows for improved field curvature correction.

[0051] According to another approach, the second lens group may include exactly two lenses. Specifically, the second lens group may include exactly one positive lens and exactly one negative lens. Furthermore, the two lenses may be glued together. This results in an improved mounting.

[0052] An alternative to this is that the two lenses can also be non-cemented. However, they can remain in a common mechanical mounting.

[0053] On the other hand, the total number of lenses in a camera adapter can not exceed three. In particular, the total number of lenses can be two or three.

[0054] It has been found that even with such a small number of lenses, and even with a large field of view, the full optical extension can be transmitted to the camera sensor virtually without obstruction. Simultaneously, the adapter can correct chromatic aberration and / or monochromatic aberration (especially field curvature) particularly well.

[0055] Specifically, in the intermediate image of the camera adapter, lateral aberrations can be ≤5 μm in the spectral range between 440 nm and 640 nm. In particular, they are close to the diffraction limit.

[0056] On the other hand, the second lens group as a whole can be in the form of a meniscus. In particular, all the lenses in the second lens group, especially all the lenses in the adapter, can be in the form of meniscus lenses.

[0057] In this configuration, the light beam is incident on the lens surface as steeply as possible. This results in exceptionally small aberrations.

[0058] Another problem addressed by this invention is to improve the combination of camera and camera adapter for microscopes.

[0059] This problem can be solved by combining the camera and camera adapter as described above.

[0060] These advantages stem from the advantages of the camera adapter.

[0061] In particular, the camera may include a sensor having a diagonal of at least 10 mm, especially 11 mm, or at least 15 mm, especially 16 mm.

[0062] Another problem addressed by this invention is the improvement of microscopes, particularly wide-field microscopes, especially fluorescence microscopes.

[0063] This problem is solved by using a microscope with a camera adapter as described above.

[0064] The advantages stem from the advantages of the camera adapter.

[0065] In particular, the camera adapter can be mounted on the microscope's support.

[0066] Therefore, the bracket can especially have a camera output end.

[0067] The camera output is positioned in the beam path of the microscope, particularly downstream of the lens in the microscope tube.

[0068] In addition to or as an alternative to the beam path to the eyepiece, a camera output can be provided. Specifically, a beam splitter or adjustable element (particularly in the form of a mirror) can be placed in the beam path downstream of the lens barrel, which can be used to optionally guide the beam path to the eyepiece or camera output.

[0069] Specifically, the camera adapter is designed such that when the camera adapter is mounted on the microscope's support, the first lens is located upstream of the intermediate image, particularly upstream of an existing intermediate image. The distance between the first lens of the camera adapter and the intermediate image is particularly in the range of 40 mm to 80 mm, and particularly in the range of 50 mm to 70 mm.

[0070] In the microscope's beam path, the distance between the last lens of the camera adapter, particularly the apex of the last lens, and the intermediate image is at least 18 mm. Specifically, it is in the range of 20 mm to 24 mm. Therefore, it can particularly effectively assist the C-mount connector.

[0071] On the other hand, all the lenses in the second lens group, especially all the lenses in the adapter, can be arranged outside the microscope's support.

[0072] In particular, all lenses of the adapter can be arranged in the beam path downstream of the object-side base surface of the adapter, especially downstream of the object-side connector of the adapter.

[0073] Therefore, the adapter's lens requires no mounting space inside the holder. Consequently, the adapter can be used very flexibly with virtually any desired holder, especially with microscopes having standardized camera outputs.

[0074] The first lens can also protrude into the support, that is, be arranged inside the support.

[0075] According to another aspect, microscopes include those with a field of view diameter d SF The field of view and the sensor diameter d Sens Image acquisition devices for sensors, especially camera-type image acquisition devices, where the diameter d of the field of view... SF Larger than the diameter d of the sensor Sens d SF >d Sens .

[0076] In this case, the field of view can preferably be imaged onto the sensor of the image acquisition device via the camera adapter, such that the vignetting of the field of view is less than 20% of the field of view diameter, particularly not more than 10%, and particularly not more than 5%.

[0077] Field diameter d SF Especially greater than 20mm, especially at least 23mm, especially at least 25mm. Attached Figure Description

[0078] Further advantages and details of the invention will become apparent from the following description of exemplary embodiments with reference to the accompanying drawings. In the drawings:

[0079] Figures 1A to 1C The diagram schematically illustrates the beam path for microscopic imaging in the region between the image-side connector of the camera adapter and the image field for different magnifications and numerical apertures.

[0080] Figure 2 A schematic diagram of the microscope beam path in the region between the camera adapter and the image plane according to the present invention is shown.

[0081] Figure 3 The structure of a microscope with a camera adapter and a camera is schematically shown.

[0082] Figure 4The beam path in the camera adapter according to the first variant is schematically shown, and

[0083] Figure 5 The beam path in the region is schematically shown according to another variant of the camera adapter. Detailed Implementation

[0084] First, refer to the following Figure 3 Describe the general structure of microscope 1. This description and Figure 3 The diagrams in this document should not be interpreted as restrictive.

[0085] Figure 3 An upright microscope 1 is shown as an example. It can also be an inverted microscope.

[0086] The microscope 1 includes a support 2. In particular, the support 2 is used for arranging the optical components of the microscope 1.

[0087] The support 2 is also used to arrange the sample 3 in the beam path 4 (shown schematically) of the microscope 1.

[0088] Specifically, microscope 1 can be a wide-field microscope. Specifically, it can be a fluorescence microscope. The light source of microscope 1 is not... Figure 3 Described in the text.

[0089] The microscope 1 includes at least one objective lens 5.

[0090] The microscope 1 includes a microscope tube unit 6.

[0091] The lens barrel unit 6 includes a lens barrel 7. The lens barrel 7 can also be a lens barrel unit with multiple lenses.

[0092] The beam path 4 converges downstream of the lens 7.

[0093] A true intermediate image 8 can be produced by using objective lens 5 and tube lens 7.

[0094] The beam guiding unit 9 can be arranged in the beam path 4 downstream of the lens 7. The beam guiding unit 9 can be a beam splitter or a beam deflector, particularly in the form of a mirror.

[0095] The beam guiding unit 9 allows the beam path 4 to be divided into a beam path leading to the camera 10 and a beam path leading to the eyepiece 11, or to switch between them.

[0096] The camera 10 is fixed to the bracket 2 via the adapter 12.

[0097] Specifically, adapter 12 is arranged in the converging beam path of microscope 1.

[0098] The adapter 12 can be used in particular to image the calibrated intermediate image 8 onto the sensor of the camera 10.

[0099] The adapter 12 includes an object-side connector 13 in the connection between the adapter 12 and the bracket 2.

[0100] The adapter 12 includes an image-side connector 14 for connecting the camera 10.

[0101] The side connector 14 can be a so-called C-type mount. In particular, this is a standardized interface, especially a standardized threaded interface.

[0102] The image-side connector 14 may have a specific flange focal length. In particular, the flange focal length of the image-side connector 14 may be 17.526 mm.

[0103] Image-side connector 14 has a net inner diameter d B .

[0104] The net inner diameter d of the side connector 14 B It can be particularly less than 24mm, particularly not more than 21.5mm, and particularly not more than 20mm.

[0105] The net diameter d of the side connector 14 B It can be particularly smaller than the net diameter d of the object-side connector 13. O .

[0106] Below, for reference Figures 1A to 1C Explain the different cases of beam path 4 in the region between image-side connector 14 and intermediate image 8.

[0107] Figure 1A The case of adapter 12 for the numerical aperture in intermediate image 8 with magnification V=1.0 and NA=0.05 is depicted. (As can be seen from...) Figure 1A The schematic illustrations collected in the image show that, given a field of view with a diameter of 25 mm, the image-side connector 14 causes occlusion at the edge of the image field in this case. This occlusion results in the loss of information.

[0108] Figure 1B The case of an adapter with magnification V=0.5 and numerical aperture NA=0.10 in the image field is illustrated by way of example.

[0109] In this case, occlusion caused by the image-side connector 14 can be avoided. However, due to the small magnification V=0.5, the maximum usable sensor diameter is correspondingly smaller. Therefore, for a given resolution, the pixel size of the sensor must be reduced accordingly. This results in a reduction in dynamic range. This is disadvantageous, especially for low-light applications.

[0110] For low-light applications, such as in wide-field microscopy, particularly in fluorescence microscopy, it is desirable to image the entire optical extension of the support 2 (especially the objective lens 5) onto the camera 10, which has the largest possible number of pixels and therefore the largest possible sensor. Figure 1C The illustration shows that, with the aid of an adapter 12 having a magnification of V=0.63, a field of view with a diameter of 25 mm can be imaged onto a sensor diagonal d of 16 mm. Sens On the sensor. In this case, even with an image-side numerical aperture of NA=0.08, the image field edge can be avoided from being blocked by the inner diameter of the image-side connector 14. Specifically, this adapter 12 allows the entire optical extension of a 25 mm diameter field of view to be transmitted unobstructed to a diameter d. Sens =16mm on the camera sensor 19.

[0111] First, the following is based on Figure 2 Explain the general characteristics of adapter 12. Therefore, based on Figure 4 and Figure 5 Specific variations of possible embodiments of adapter 12 are described.

[0112] According to the present invention, it is recognized that, assuming the adapter consists of only a single lens or a single lens group, the object-side lens of the adapter 12 must be positioned relatively far upstream of the image-side connector 14 in the beam path. Typically, there is insufficient space for this. Therefore, according to the present invention, the beam path 4 is first focused using the first lens group G1. In particular, the lens group G1 has positive refractive power.

[0113] A second lens group G2 with negative refractive power is arranged downstream of the first lens group G1 in the beam path 4. Due to the second lens group G2, the beam is incident on the image plane 16 with a small angle of inclination, that is, with the smallest possible angle of incidence relative to the normal 15.

[0114] Figure 4 The beam path 4 in the adapter 12 according to the first variant is schematically shown. The mechanical components of the microscope 1, particularly the mechanical components of the support 2 and the adapter 12, are... Figure 4 There is no actual depiction. Only the orientation of the bracket 2, and particularly the orientation of the outer side 17 of the bracket 2, is shown. In addition, the orientations of the object-side connector 13 and the image-side connector 14 are shown.

[0115] The adapter 12 includes three lenses L1, L2, and L3.

[0116] Lens L of adapter 12 i They were assigned to two groups, G1 and G2.

[0117] The first group G1 includes lens L1.

[0118] The first group G1, especially the first lens L1, has positive refractive power. The first lens L1 has a focal length of 112 mm.

[0119] The second lens group G2 includes lenses L2 and L3.

[0120] Lenses L2 and L3 form a cemented doublet lens.

[0121] The second lens group, G2, has negative refractive power. The focal length of the second lens group, G2, is -181.3 mm.

[0122] The second lens L2 has positive refractive power. The focal length of the second lens L2 is 49.6 mm.

[0123] The third lens L3 has negative refractive power. The focal length of the third lens L3 is -33.0 mm.

[0124] The overall thickness of the second lens group G2 is 10.73 mm.

[0125] The distance d* from the outer side 17 of the bracket 2 to the plane 18 is 60mm. Without using the adapter 12, the intermediate image will be located in the plane 18.

[0126] The distance d between the last lens L3 (especially its vertex) in beam path 4 and the actual image plane 16 Bild It is 22.06mm.

[0127] The distance between the outer side 17 of the support 2 and the image plane 16 is 38.73 mm.

[0128] Lens L1 has a diameter d L1 .

[0129] The object-side connector 13 has an internal net diameter d O .

[0130] Image side connector 14 has an internal net diameter d B .

[0131] The following applies: d O >d B .

[0132] The following applies: d L1 >d B .

[0133] The optical design data for the adapter is summarized in Table 1.

[0134]

[0135] Table 1

[0136] In this case, all specifications related to the refractive index ne and the Abbe number ve refer to the e-line, which refers to light with a wavelength λ = 546 nm.

[0137] Figure 5 The beam path 4 in a variant of adapter 12 is depicted. Adapter 12 has the same characteristics as... Figure 4 A structure similar to that of [the other]. According to [the relevant source] Figure 5 The various components of the adapter 12 have the same Figure 4 The same reference numerals are used in the accompanying drawings, and their description herein is referenced. The following description is based solely on... Figure 5 Adapter 12 and according to Figure 4 The differences between adapter 12.

[0138] The first lens L1 has a focal length of 130.3 mm.

[0139] The focal length of the second lens group G2 is -284.0mm.

[0140] The focal length of the second lens L2 is 42.5mm.

[0141] The focal length of the third lens L3 is -31.1mm.

[0142] The overall thickness of lens group G2 is 10.1 mm.

[0143] The distance d between the last lens L3 (especially its vertex) in beam path 4 and the actual image plane 16 Bild It is 22.05mm.

[0144] The distance between the outer side 17 of the support 2 and the image plane 16 is 39.35 mm.

[0145] according to Figure 5 The optical design data for the adapter are summarized in Table 2.

[0146]

[0147] Table 2

[0148] In this case, all specifications related to the refractive index ne and the Abbe number ve refer to the e-line, which refers to light with a wavelength λ = 546 nm.

Claims

1. A camera adapter (12) for use in the converging optical path of a microscope, comprising: 1.1 Object-side connector (13), 1.2 Image-side connector (14), 1.3 Multiple lenses (L) i (i≥1), and are placed in at least two groups (G1, G2). 1.3.1 The lens (L) mentioned above i The first group (G1) has positive refractive power, and 1.3.2 The lens (L) mentioned above i The second group (G2) has negative refractive power.

2. The camera adapter (12) according to claim 1, characterized in that, The camera adapter (12) has a paraxial magnification in the range of 0.5 to 0.

8.

3. The camera adapter (12) according to any one of the preceding claims, characterized in that, The image-side connector (13) is a C-type mounting connector.

4. The camera adapter (12) according to any one of the preceding claims, characterized in that, The first group (G1) of lenses (L) i The focal length ranges from 50 mm to 200 mm.

5. The camera adapter (12) according to any one of the preceding claims, characterized in that, The first group (G1) includes positive lenses (L) made of a material with an Abbe number (ve) of at least 55. i ).

6. The camera adapter (12) according to any one of the preceding claims, characterized in that, The first group (G1) includes at least one lens (L1), the diameter (d1) of which is larger than the net inner diameter (d) of the image-side connector (14). B ).

7. The camera adapter (12) according to any one of the preceding claims, characterized in that, The focal lengths of the lenses (L2, L3) in the second group (G2) are in the range of -350 mm to -50 mm.

8. The camera adapter (12) according to any one of the preceding claims, characterized in that, The lenses (L2, L3) in the second group (G2) are either meniscus lenses or a combination of a positive lens (L2) and a negative lens (L3).

9. The camera adapter (12) according to any one of the preceding claims, characterized in that, The second group (G2) of lenses (L) i This includes positive lenses (L2) made of materials with an Abbe number (ve) of at least 50 and negative lenses (L3) made of materials with an Abbe number (ve) in the range of 35 to 55.

10. The camera adapter (12) according to any one of the preceding claims, characterized in that, The second group (G2) of lenses (L) i The system includes a positive lens (L2) and a negative lens (L3), the refractive indices of which differ by no more than 0.

1.

11. The camera adapter (12) according to any one of the preceding claims, characterized in that, The second group (G2) of lenses (L) i It includes a positive lens (L2) and a negative lens (L3), both of which are made of materials with a refractive index of at least 1.

55.

12. The camera adapter (12) according to any one of the preceding claims, characterized in that, The second group (G2) of lenses (L) i It includes a positive lens (L2) and a negative lens (L3), which are cemented together.

13. The camera adapter (12) according to any one of the preceding claims, characterized in that, The lens (L) i The total number of () does not exceed three.

14. The camera adapter (12) according to any one of the preceding claims, characterized in that... The following design data: or 15. A camera system (12) having: 15.1 Camera (12) for microscopes, and 15.2 The camera adapter (12) according to any one of the preceding claims.

16. A microscope (1) having a camera adapter (12) according to any one of claims 1 to 14.

17. The microscope (1) according to claim 16, wherein, The microscope (1) has a field of view (SF) and an image acquisition device (10), the field of view (SF) having a diameter (d) SF The image acquisition device (10) has a sensor (19), and the sensor (19) has a diameter (d) Sens ), where the diameter (d) of the field of view SF The diameter (d) of the sensor is greater than that of the sensor. Sens ), and wherein the field of view (SF) is imaged onto the sensor (19) via the camera adapter (12), such that the vignetting of the field of view is smaller than the field of view diameter (d). SF 20% of ).

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