Quote:
Originally Posted by alpal
The point with an OAG is that if you watch the guide graph
& it's nice & steady you know for sure that the result will have nice pin point stars.
You'll never have to throw away another sub frame.
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Unless your polar alignment is inaccurate and then you get field rotation with long subs, in particular when imaging near celestial pole, or there still may be flex between the guide camera attached to the OAG and the main camera...
Both happened to me...
