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the UHTC coatings are meant to be worth the extra cause of the ammount more light (think of it as adding a little apature, so it can get a bit more light than a non-UHTC of the same size - resolving power stays the same tho)
To get a decent goto scope you will be paying more than for the GSO dob - and probably will not see so much, but depends on how good you are at reading star maps and stuff - if your impatient the GOTO might be better - if you want to learn where stuff is and about it then the Dob is definately better.
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