After about ten years of shooting 35mm film, I recently "went digital," buying a pair of Nikon D200s, both in nice shape. I mostly use non-AI (converted), AI, and AIS lenses with it. I notice that when I have some of my older lenses on one of the D200s, on the continuous high setting, the first shot will be noticeably darker--about 0.5 to 0.67 EV. The rest, usually three or four more shots, all fired in succession, will be perfectly exposed. I shoot in manual mode. I have noticed this behavior with these lenses: the 50/2 AI, the 50/2 NPK (converted), the 200/4 NPK (factory converted). I have not noticed it with my 105/2.5 NPK (converted). The shots, otherwise, look fine--tack sharp and very nice. Though, I think the 200/4 NPK may be showing its age, as its focus looks to be off. Again, the two 50mm lenses take nice photos. I do not have exposure comp. on, and even then it would compensate on the whole series of shots taken, not just one. They are outdoor shots, and the sun seemed to be constant in all cases. The pattern seems to be consistent--first shot darker, the next fine. What is going on here? I welcome your comments.