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The light getting into a scope increases as the square of the radius.
so 8" would be 4x4=16, 10" would be 5x5=25 so the ight would be about 1.5 times as much - which is quite an increase for a couple of hundred dollars.
I'm not a personal fan of 8" Dobs - they seem a little cumbersome for the size of mirror - whereas the 10" is a definite wow.
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