Canon could come out with a special FD to RF lens adapter for use with its retro camera. This would be more than a passive extension tube.
I might be getting ahead of myself because I have never used existing FD/RF adapters. I believe when using the adapter, the FD lens aperture “stop down” lever must be in the “locked” position. The user then sets the lens aperture ring to wide open for focusing and then sets the lens aperture ring to what is desired for the particular exposure.
There is mechanical aperture ring setting information available. In the purely mechanical Canon FD lens mount cameras, this mechanical coupling of the lens aperture setting moves the “match needle” index for the internal exposure meter.
I am not familiar with the RF lens electrical interface, but it is conceivable that FD lens aperture mechanical position could be “read” in the adapter and converted to digital information for the RF mount camera.
Following on this idea, it is conceivable that, with a little more electromechanical engineering, full aperture metering and shutter priority AE exposure could be performed using this hypothetical adapter. Basically, this would be a redo of the Canon AE-1 (and subsequent) FD lens interface.
I might be getting ahead of myself because I have never used existing FD/RF adapters. I believe when using the adapter, the FD lens aperture “stop down” lever must be in the “locked” position. The user then sets the lens aperture ring to wide open for focusing and then sets the lens aperture ring to what is desired for the particular exposure.
There is mechanical aperture ring setting information available. In the purely mechanical Canon FD lens mount cameras, this mechanical coupling of the lens aperture setting moves the “match needle” index for the internal exposure meter.
I am not familiar with the RF lens electrical interface, but it is conceivable that FD lens aperture mechanical position could be “read” in the adapter and converted to digital information for the RF mount camera.
Following on this idea, it is conceivable that, with a little more electromechanical engineering, full aperture metering and shutter priority AE exposure could be performed using this hypothetical adapter. Basically, this would be a redo of the Canon AE-1 (and subsequent) FD lens interface.
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