Originally posted by Cuthbert Would it be better to use a telescope or a big reflex tele?
I think so. After spending several months trying various 645/67 lenses on 645z, I decide to almost use it on my telescope exclusively. I will leave wide-field work like this to my D800 and Sigma Art lenses. With similar total exposure time, I can reach much better quality with D800+35/1.4 than 645z+35/3.5.
Pentax, wake up! This is the best camera for astrophotography, but it doesn't have good lenses. You used to produce one of the best astrographs, you should know this.