Dan, Yes, I'm wondering what the time interval was between placing and aligning the plates and actually blinking the images. Must have been time consuming and I've heard that handling the glass plates meant often breaking them - Bummer! =20 For comparison, some amateur grade software can load, calibrate, reduce and blink the frames in just a few minutes. Moreover, automatic detection routines can even pick out the movers in the frames. Makes you truly appreciate the effort this task once was and those who did it..=20 -Scott =20 > Still, it seems a step backwards from what we can do on a=20 > computer these > days. >=20 > Dan Heim > President > Desert Foothills Astronomy Club > http://www.dfacaz.org >=20 -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.