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Thank you mike7.62 for setting the record straight. Besides that, the objective lens size only needs to be large if you use very high power. For very low light conditions, you want the objective to be 5 times the power, so 45 (or 44) for a 3-9x variable. But if you have a 3-9x by 36 mm, then just dial down to 7x to get the most light gathering your eye can use.
And of course, the quality of the glass and it's coatings make more of a difference than the objective lens size, so choose wisely.
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