On Tue, May 31, 2005 at 02:08:10PM -0400, Collin Brendemuehl wrote: > > The camera would have to make no assumptions at all. > A simple calibration stepper movement could inform the firmware > what the minimum, maximum, and in-between values are.
Only if you're using the TTL metering, which assumes you are keeping the camera in an area of constant illumination. Otherwise all you measure is the amount of travel on the actuating lever, which isn't particularly useful. I really think that the prospective audience for such a feature is vanishingly small; if you're in an environment where you can calibrate the lens you're probably better off using something other than the in-camera metering. Plus, of course, there's no way for the camera to detect that the aperture ring on the lens is set to a position that would allow the lens to stop down to the aperture the camera has chosen. That's one more place for user error to cause an incorrect exposure - something that Pentax appear to try pretty hard to prevent.
