I wanted to eliminate the aperture from the equation, Mike, and see if it was something within the camera. After your comment I did the test again with the aperture @ F8.0. Exposures were erratic. I guess the lens needs a CLA :-((
Thanks to all for your suggestions. Shel > [Original Message] > From: mike wilson > Don't you need to do the same with the aperture at least partially closed?
