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i'm no expert. but teh difference from a 8 - 12" scope is huge.
comparing 47 tuc for example. was a big difference. in teh 12" the stars were brighter and you could clearly see more of them. they spread further out.
my 8" was still great, no doubt about that, but didn't show the same amount of stars.
both scopes were collominated that night so nothing wrong there.
get teh best scope u can afford if you are getting a dob. the bigger the apature the more you will enjoy your viewing. but remember there is the prob in size and portability. you can lug around a 8" scope and setup in 5 mins, where a 12" might take 1/2 hour.
good luck with what ever u decide.
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