Difference between revisions of "Canon F-A"
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|[https://www.flickr.com/photos/thorpehamlet/8970365231/ https://live.staticflickr.com/8403/8970365231_6fc322e14e.jpg] | |[https://www.flickr.com/photos/thorpehamlet/8970365231/ https://live.staticflickr.com/8403/8970365231_6fc322e14e.jpg] | ||
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|image_text= Canon F-A with motor-drive MZ | |image_text= Canon F-A with motor-drive MZ | ||
|image_by= John-Henry Collinson | |image_by= John-Henry Collinson | ||
|image_rights= with permission | |image_rights= with permission | ||
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| − | The '''Canon F-A''' is a 35mm SLR camera for ophthalmic examination, produced in small numbers by [[Canon]] in about 1980. It appears to be based on one of the mainstream A-series cameras (perhaps the [[Canon AE-1|AE-1]]: the controls on the left of the lens-mount are the same), and has a normal [[FD mount|FD bayonet flange]], but | + | The '''Canon F-A''' is a 35mm SLR camera for ophthalmic examination ('Fundus photography': photography of the back of the eye, including the retina and macula and associated blood vessels.<ref name=Fundus>[https://en.wikipedia.org/wiki/Fundus_photography Fundus Photography] at Wikipedia.</ref>), produced in small numbers by [[Canon]] in about 1980. It appears to be based on one of the mainstream A-series cameras (perhaps the [[Canon AE-1|AE-1]]: the controls on the left of the lens-mount are the same), and has a normal [[FD mount|FD bayonet flange]], but also several strange features: |
| − | *The image frame in the film chamber is not rectangular; it has curved ends, perhaps suggesting use with a lens whose image circle does not cover the full frame. The mask also has a second small frame in its bottom-left corner; the | + | *The image frame in the film chamber is not rectangular; it has curved ends, perhaps suggesting use with a lens whose image circle does not cover the full frame. The mask also has a second small frame in its bottom-left corner; this allows limited data imprinting, of a small piece of text (e.g. the patient's name) or an exposure serial number, or the duration of exposure.<ref name=Manual>[https://www.butkus.org/chinon/canon/canon_fundus/canon_fundus.htm Canon CF60-ZA Fundus Camera Operation Manual] at Mike Butkus' [https://www.butkus.org/chinon/canon.htm OrphanCameras.com]</ref> |
| − | *The mirror in the camera is unusually large. A forum post at ''phototrio.com'' states that the mirror fouls a normal FD lens when released, and that the camera must be used with bellows or an extension tube.<ref name=PT>[https://www.photrio.com/forum/threads/canon-fa.83212/ Canon FA] at ''phototrio.com'' forums (thread from 2011)</ref> | + | *The mirror in the camera is unusually large. A forum post at ''phototrio.com'' states that the mirror fouls a normal FD lens when released, and that the camera must be used with bellows or an extension tube.<ref name=PT>[https://www.photrio.com/forum/threads/canon-fa.83212/ Canon FA] at ''phototrio.com'' forums (thread from 2011)</ref> In fact, the manual for the fundus camera warns that ''the reflex mirror will break'' if released with an FD lens in place.<ref name=Manual/> |
*Another post in the same forum thread states that the viewfinder image is upside-down and reversed; that is, there is no [[pentaprism]] in the VF.<ref name=PT/> | *Another post in the same forum thread states that the viewfinder image is upside-down and reversed; that is, there is no [[pentaprism]] in the VF.<ref name=PT/> | ||
*The camera has a large, circular eyepiece, with [[diopter|dioptric correction]] between +2 and -4. | *The camera has a large, circular eyepiece, with [[diopter|dioptric correction]] between +2 and -4. | ||
| − | A motor-drive, Motor Drive MZ, was made for it. | + | A motor-drive, '''Motor Drive MZ''', was made for the camera. This has six electrical contacts in a row on the front. These allow the camera to be controlled via the large ophthalmic instrument '''CF60-ZA''' of which it forms only the recording part. |
| + | The lens is fitted to the instrument, not directly to the camera. In use, the patient is positioned for photography using a chin-rest, and the lens is approximately 45mm from the surface of their eye. The instrument allows zooming between 20- and 60-degree views. It can be used for simple colour photography of the rear of the eye, after applying mydriatic eye-drops (which dilate the pupil of the eye; later fundus cameras do not require these). It can also be used to photograph the eye after staining with fluorescein. This requires special filters, inserted in a slot in the instrument. Another slot allows the insertion of cards, hand- or type-written with text to be imprinted on the film. The eye may be continuously illuminated with a halogen lamp, or by flash.<ref name=Manual/> | ||
==Notes== | ==Notes== | ||
<references/> | <references/> | ||
| − | [[Category:Canon]] | + | [[Category:Canon|F-A]] |
| − | [[Category:35mm SLR]] | + | [[Category:F|F-A Canon]] |
| + | [[Category:Japanese 35mm SLR]] | ||
| + | [[Category:Medical cameras]] | ||
Latest revision as of 04:52, 19 April 2023
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images by John-Henry Collinson (Image rights) |
The Canon F-A is a 35mm SLR camera for ophthalmic examination ('Fundus photography': photography of the back of the eye, including the retina and macula and associated blood vessels.[1]), produced in small numbers by Canon in about 1980. It appears to be based on one of the mainstream A-series cameras (perhaps the AE-1: the controls on the left of the lens-mount are the same), and has a normal FD bayonet flange, but also several strange features:
- The image frame in the film chamber is not rectangular; it has curved ends, perhaps suggesting use with a lens whose image circle does not cover the full frame. The mask also has a second small frame in its bottom-left corner; this allows limited data imprinting, of a small piece of text (e.g. the patient's name) or an exposure serial number, or the duration of exposure.[2]
- The mirror in the camera is unusually large. A forum post at phototrio.com states that the mirror fouls a normal FD lens when released, and that the camera must be used with bellows or an extension tube.[3] In fact, the manual for the fundus camera warns that the reflex mirror will break if released with an FD lens in place.[2]
- Another post in the same forum thread states that the viewfinder image is upside-down and reversed; that is, there is no pentaprism in the VF.[3]
- The camera has a large, circular eyepiece, with dioptric correction between +2 and -4.
A motor-drive, Motor Drive MZ, was made for the camera. This has six electrical contacts in a row on the front. These allow the camera to be controlled via the large ophthalmic instrument CF60-ZA of which it forms only the recording part.
The lens is fitted to the instrument, not directly to the camera. In use, the patient is positioned for photography using a chin-rest, and the lens is approximately 45mm from the surface of their eye. The instrument allows zooming between 20- and 60-degree views. It can be used for simple colour photography of the rear of the eye, after applying mydriatic eye-drops (which dilate the pupil of the eye; later fundus cameras do not require these). It can also be used to photograph the eye after staining with fluorescein. This requires special filters, inserted in a slot in the instrument. Another slot allows the insertion of cards, hand- or type-written with text to be imprinted on the film. The eye may be continuously illuminated with a halogen lamp, or by flash.[2]
Notes
- ↑ Fundus Photography at Wikipedia.
- ↑ 2.0 2.1 2.2 Canon CF60-ZA Fundus Camera Operation Manual at Mike Butkus' OrphanCameras.com
- ↑ 3.0 3.1 Canon FA at phototrio.com forums (thread from 2011)
