> David, this sounds like bad news. The mechanical aperture coupling > on your PZ-1p appears to have shifted. Exposure should be affected > with all manual lenses. However, it should expose correctly with > F/FA lenses, as these transmit indeed the aperture value as part of > the digital protocol.
I do not know if I understand correctly. As I can observed, the aperture read out has no effect on the actual exposure accuracy. It is just a value "guessed" by the camera and displayed in the viewfinder LCD. The chosen shutter speed is determined solely by the EV level and position of the contact on the variable aperture resistor. Due to the mechanical manufacturing tolerance differences, some cameras or lenses may be off a little bit. >DAM> So does the lens actually communicate this >DAM> information to the body electronically? Yes. But when the F/FA lenses were set other than 'A', I believe the position of the aperture resistor coupling makes the difference too. For instance, if you set the lens at f5.6, grip the lens and try to rotate, the read out may become f4.5 or f6.7 (vary from lens to lens and camera to camera). regards, Alan Chan _________________________________________________________________ Join the world�s largest e-mail service with MSN Hotmail. http://www.hotmail.com - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
