Quote:
Originally Posted by SuperG
Many say the hardest part is the focusing. I don't think that's true. That's the easy part. Trying to find a guide star is the hardest part. I also find that stars are very very dim in the oag camera and definately not round. The one image I got using an OAG is very good but I was faffing about for ages trying to trying to find a guide star. And that was in acrux????? With the weather the way it is, I haven't gone back to the OAG.
Oh and I was using a C6 SCT .
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Indeed, small corrected imaging circle does make guiding with an OAG more tricky as stars will have significantly distorted shapes away from the optical axis at the distance where OAG operates. Binning, possibly 3x3, would have helped to increase SNR in the guidecam. Guidecamera with big pixels and a scope with a large corrected imaging circle both make life easy when using an OAG.