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Thanks for all the comments guys. Your right Mike there are too many things that can go wrong in a 40 min sub but I just wanted to see just how far I could push my guiding and still get round stars and at what focal length. I guess it's like with a car, you just like to know what the top speed I'd but you don't do it all the time. At the moment I'm looking at getting the best OAG that I can - any suggestions out there?
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