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The truth on the objectives is the large objectives are only a help when you start to go over 15-16 power in low light. They only put them on the lower magnification for "americans, bigger is better attitude".
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Someone has pulled the wool over your objective lens. For the same magnification, light gathering is directly proportional to the square of the objective lens diameter (ie, a small increase in objective lens can yield a Ginormous increase in visibility under low light conditions.
It's a trivial calculation
exit pupil size = objective lens dia/magnification
BTW, I agree that RUMS rule. I currently have 3 and the 4th (and best, 7mm) in the planning.