Yup. Heck, some shipping Pentax film bodies do this anyway, don't they? ZX-7, ZX-L, etc...
[EMAIL PROTECTED] wrote:
John had a complicated method for getting a *istD successor to
correctly operate K and M lenses with camera-aperture-control.
Nikon has a similar scheme in the D2h to allow matrix metering and such with older CPU-less lenses, which is odd since the FA of 1983 could do it without the manual input of information.
Wouldn't it be simpler to build a daddy-D with an aperture-tracking-tab
so that it could meter correctly at full aperture, but NOT attempt
to overcome the difference in aperture-lever travel between K/M and A/F/FA
lens lines. It would let you use your K and M lenses in aperture-priority
and manual just like you always did, and more modern lenses with all the
newfangled modes. Pentax could top this off by re-issuing some of the older lenses in FA variants for people who just have to have "P" mode
with their 18/3.5.
If the camera "knows" when it's got an A or better lens mounted due to electronic communication, it could refuse to go into advanced exposure modes unless it found a modern lens attached--just give a snippy error message.
DJE
