>I'm too tired to conduct another test tonight, so I'll ask the >simplest questions: does the EV difference (aperture selected by >thumbwheel as compared to aperture selected at aperture ring) occur >only wide open, or wide open and stopped down, or only when stopped >down?
I have had 2 Z-1p (1 now) and both with the same problem (or not a problem at all to some). Some lenses are pretty accurate, and some with differences. For those with differences, the differences apply to all aperture setting, not just wide opened or stopped down. >Is the variation predictable and repeatable at a given F-stop for a >specific lens model and camera model? Or does it vary for each lens of >a given model, much as the optical performance of each sample of a >given lens varies slightly? I am not sure on this, but I suspect the Z-1p was the problem. Asking for perfect calibration in this situation seems impossible to me (consider there have been so many K mount lenses over the years). >Does you expereience of 2/3 EV variation mean plus-or-minus 2/3 EV for >a 4/3 EV range, or plus-or-minus 1/3 EV for a 2/3 EV range? 0 to -2/3EV only on film. >Thanks if you can relate your experience on any of my questions. I >will try out some tests for myself this weekend. I'm always willing to >learn something new to help reduce unnecessary variables in my >exposures. Just set your lens at 'A', choose the widest aperture on the Z-1p (f1.4 etc), fire the shutter and you will see. regards, Alan Chan _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp - 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 .
