"Ron" wrote in message
...
Is it practical to consider using older Nikon AIS manual-focus lenses
with a D40?

According to the manual, AI-S and other non-CPU lenses can be used only in M
mode. The electronic rangefinder in the lower left of the viewfinder can
still be used with such lenses as long as they have a maximum aperture of
f/5.6 or faster.

Neil