7 Dec
2004
7 Dec
'04
9:41 a.m.
Has anyone (Rob? Patrick?) tried tracking fairly long-exposures with a "fisheye" lens? I'm wondering if, guiding on a star near the center of the field, if the edge stars trail because of differential atmospheric refraction? A few years ago I acquired a nice fisheye lens with a FOV darned near 90 degrees, and would like to try it on the sky when the weather warms up. Any meaningful input based on experience is welcome. __________________________________ Do you Yahoo!? Yahoo! Mail - You care about security. So do we. http://promotions.yahoo.com/new_mail