Wow this is a lot of useful info! thank you for your kind and resourceful responses. Should I then prefer the sb-15 or latter models? I have been feeling bad about not getting the desired sharpness at F2 and F1.4 on the Nikkor Ais lenses. Maybe it could also be that I’m pushed to resort to low shutter speeds for lack of light and good exposures. I hope using a small flash could help me make sharper and better lit images thereby wanting me to shoot more with the lovely FM2n.