Just came in from looking at the moon in a little 3 inch f6 reflector. It's still daylight here but it got me to thinking. Has anyone done wide field astrophotography with their 4x5? The 90 is so light it would put no stress on a barndoor mount and the wide field of the 90 mm lens could suffer slightly inperfect alignment. Of course, f6.8 is very slow, and if you stopped down to f16 to clean up the edges that could make for some very long exposures, too long for a barndoor mount to trac accurately. So....Is was just curious if any here had used their 4X5 for night sky photography.
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