"Why is it possible to use pre-Ai on D40 and not on D80?"
I was wondering why on this table ( http://www.nikonians.org/nikon/slr-lens.html )is stated that it is possible to use pre Ai lenses on D40 without damaging the bayonet and not on D80. Both of them lack of the meter coupling lever so what is the difference in the bayonets that allow to mount F lenses on D40 (and similar) and not on D80 (and similar)?
#1. "RE: Why is it possible to use pre-Ai on D40 and not on D80?" In response to Reply # 0
It's not the metering coupling lever that's of concern. It is the small "minimum aperture detection tab" that can be damaged. On the D40, this tab can be pressed inward by the lens flange, but not the the D80. This tab/lever is at about 8 o'clock as you look at the front of the camera just outside of the lens mount plate.