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i dont know why those 2 scopes ate the same price. the gs500 has more aperture so i'd go for that one. the mount might not be stable enough for deep sky astropics tho... and it doesnt have tracking anyhow so unless you plan on buying a RA motor you might as well buy a dob.
wht sort of camera have you got?
ps: the gs680 is the same price.
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