Nenad, as explained below, the seventh pin makes the difference between 'A' and 'F' in this respect. http://www.bdimitrov.de/kmp/ has all this and much more - not quite easy to find, though. From the main page you select 'Technology' on the left, then 'K-Mount Evolution, Features and Operation'. On the bottom of this page you can then click on the various K-mount variants and you get thorough explanations and diagrams.
Sven Zitat von John Francis <[EMAIL PROTECTED]>: > > > > William Robb wrote: > > > When the lens is off A, the electrical contacts are disabled, and the > > > lens has no electrical communication at all with the camera. > > > It's not just AF cameras. The Super Program is the same way. > > > > Having switched to digital and no longer having any film camera bodies I > > can't check this - but I could have sworn that F and FA lenses on an AF > body > > gave an aperture readout on the camera at all times (but A lenses didn't). > > But that's because they communicate this information via the digital > readout pin, not via the mechanical aperture coupler. As far as I know > Pentax have never made a camera that used the maximum-aperture value > (read from the A-mount contacts) and the aperture-delta value (from the > aperture coupler) to calculate the actual lens aperture setting. ...
