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Old December 16, 2012, 11:53 AM   #6
Senior Member
Join Date: August 1, 2010
Posts: 461
The tube diameter has no effect on the optical performance of the scope. It has no effect on light transmission.

Things that matter are quality of glass and coatings, objective lens diameter, magnification, and exit pupil. Size of the scope tube does not figure into the equation.

For best low light performance, you want the exit pupil of the scope to be at least as large as the entrance pupil of your eye.
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