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Carl
It has taken a while to get the guiding working so that Im happy with it at that focal length. I have used OAG previously but I find that I can do just as well but easier using a separate guidescope. I know thats against current wisdom but have done 30 and 40 min subs with my setup and no problems except for aircraft which make a bee line for my small spot of sky (see attached image which was the first of a set of subs.)
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