"John Francis" <[EMAIL PROTECTED]> wrote: >I believe the FA lenses also incorporate aperture-sensing encoders on >the inner mechanism, so it is possible for such a lens to accurately >report aperture setting over the digital communication pin. I fully >expect to see a future Pentax body that relies on some such capability >to control aperture, rather than the mechanical method used today. >(Whether such a body will work with "A" lenses is an interesting point).
I'm pretty sure it *will* support "A" lenses. See below. >I see moving to the precision of electronic communication and control >as a positive step, rather than relying on the mechanical techniques >appropriate for twenty-five years ago, with all their inaccuracies. I have little doubt that electronic (in the lens) aperture control is coming eventually - there's just no way to avoid it if Pentax is going to avoid being left behind by everyone else (and thus going out of business - which none of us wants, right?) >What would an all-electronic mount look like? My guess is that the aperture indicator tab (or "aperture simulator" or whatever you want to call it) has been removed because new control contacts are going be added in that location. The reason for adding these new electrical connections instead of using the present ones in the lens mounting flange itself would be sou you can have both (and thus preserve backward compatibility with "A" lenses). In other words, we're giving up backwards compatibility with K and M lenses so that we can maintain compatibility with A lenses in the coming electronic lens mount. -- Mark Roberts Photography and writing www.robertstech.com
