Hi Don, As far as binoculars go, I always assumed the most important factors for astronomical work were matching the exit pupil size to your own dark-adapted pupil size, and getting as much aperture as possible (within the constraints of comfort). I have 7mm pupils (which will get smaller as I age), so 7x50s or 8x56's are best (I have the latter). I'm not sure if anyone makes 10x70s, but that would be as much magnification as I'd want. Any more than that, and they get too heavy to hold steady at the higher magnification -- thus requiring a tripod. 12x50s and 20x60s are not nighttime binoculars -- 4.2mm and 3mm pupils, respectively, are too small for night use. You'd use these for birding or sporting events. Cheers, Rob ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Wed Apr 11 2001 - 14:59:16 PDT