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Just to follow up - Go the 12" if you can afford it. It will make a difference for the DSOs. I use a basic laser collimator to get things close if I'm just checking out a planet or the moon, and then if the seeing is really good and I'm going for DSOs I'll finish off with a catseye autocollimator. I only got the autocollimator when I picked up the 14", on the 10" dob I just used the Laser (barlowed) and was happy enough.
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