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Astrophotography Thread

No.2575236 View ViewReplyOriginalReport
New astrophotography thread

Starting with a serious question, what is the consensus on using 500mm or 800mm mirror lens?
I'm going to use an old Pentax K-5 with the GPS thingy for sensor tracking and the bigger normal telephoto lens are waaay expensive and these funky "little" mirror lens are so cheap.
Are they worth the money or is this the good old you get what you pay for trap?