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For the same dollars at Andrews you will get an 8 inch which has almost 80% more light gathering area than the abovementioned 6 inch. A 2 inch jump in aperture may not seem much but in surface area it's a huge step. Add to that the fact that the $449 GS Dob on offer at Andrews has a deluxe crayford focusser and right angle viewfinder. The tube length on the 6 inch is just as long as the 8 inch so there's little space saving in the 6 inch as well.
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