In article <4dtikq$c3j@decaxp.harvard.edu>, kkobayas@scws44.harvard.edu says...

>Can anyone tell me which Nikon manual-focus camearas have a mirror >lockup feature? I understand FM-2n does not? And are there any that >also have a mechanical shutter? And if it's not too expensive used, >even better... I'm interested in getting one for astrophotography as >well as a backup camera,

The "F" series Nikons (F, F2, F3, F4) all have mirror lock-up, but
it is somewhat awkward to use on the F for single frames. The FM,
FM-2, FE, FE-2, FA, FG, FG-20 (and EM?) have a quasi mirror-lock-up
feature, in that using the self timer raises the mirror and closes
the diaphram at the beginning of the timer cycle. The F, F2, FM,
and FM-2 have mechanically-timed shutters.
Hope This Helps