Originally posted by Jimfear Would it be difficult for Pentax to add support for K and M lenses? In the past it has been mechanical but it should be possible to do this through software right? Or am I missing something vital here?
Originally posted by newarts It is certainly possible for software to compute different aperture lever motions for different type lenses, but I think there might be a few interface problems with the lens and also with the user.
As a critical example, an F1.2-F22 A type lens not set to "A" on the aperture ring looks to the camera exactly the same as all type K or M lenses (all pins grounded except "A"). How would this case be handled?
It might be that a single case of potential confusion like the above is the reason Pentax has not added more complete support for legacy lenses.
Dave
PS I've found it marginally useful to make my camera think all lenses are A type; this enables
P-TTL flash for all lenses (which I use infrequently).
i think it would be relitively simple but not how you are thinking.
Start by programming max and min aperture in the same way as you do focal length, then use the green button to let the camera meter open and stopped down, it will then know the aperture setting of the lens, and it can use this in P-TTL flash.
alternatively, with the camera could with manual aperture lenses in P-TTL mode you could stop down before the preflash metering, then flip the mirror, in this way it would still use the cameras metering for flash.
As for normal metering, and AV mode, you would have to accept somewhere an error, for lenses taken out of the A mode, you can't have it both ways