Quote:
Originally Posted by pmrid
Yes, but there was a kind of logic in this choice. I was working on the suggestion that you should try to achieve a F/ratio of about pixel size x 5. And since the ED127 is a native F/7.5, and my ASI290MC has pixels of 2.9 microns, using a x2 Powermate got me close to the mark. I have an 8 inch RC at F/8 and the Powermate/ASI290 combo would work with that as well. And an 8 inch newt at F/5 that would need a x3 Barlow to get there. Nest time for those.
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Should have kept that 10" conical you had Peter. That was a planet killer.