I recently borrowed a friend's Promaster 28-70 f3.4-4.5 zoom lens to use in photographing a friend's wedding. I used this lens on my N6006 with my Sunpak 522 flash. As the flash is nondedicated I set the camera in manual mode, using 1/125 as my sync speed. It seemed to work ok at first, then I noticed the shutter speed seemed to be much slower than the speed I had set. I also noticed that the aperture set on the lens did not match my camera's LCD readout, for example with the lens set wide-open at f3.5 the readout said f4.5, at f22 it read f32. I immediately replaced the Promaster with my Nikkor 50mm f1.8 and the problem stopped. After the wedding I put the lens back on and tried it again in manual and aperture preferred modes and got the same mismatch in readings. Any thoughts on what is going on here? Is the lens defective? My friend uses it on an FG and hasn't had any trouble with the lens, in fact he really loves the lens. I realize that his FG doesn't use the same exposure system or electronics as the 6006 so he wouldn't notice the trouble. There is a camera store near my home that sells this lens so I'm going to test a new one to see if the trouble shows up on their lens. Wait a minute! A thought just occurred to me. This is a variable aperture lens. Does that affect the entire aperture range or just the maximum aperture? One other question. Is there a CPU in the lens? I'm fairly new to AF and I'm learning more as I use the camera. I thought there may have been a problem with the lens' CPU if it has one. Please pardon my ignorance. If I had the money I'd definitely buy all Nikkor lenses and be done with any doubts as to compatibility issues. Oh well, guess I'll just have save my pennies. BTW I really prefer the Digest as it is now. I look forward to checking my email everyday. Nikon Digest rocks! Thanks for any advice. George
