Originally posted by Mud Shark
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Divide your exit pupil by the diameter of your objective lens. This is the power that will transmit the most light. For example if your exit pupil is 7mm divided by a 50 mm objective your best setting will be roughly 7 power. Hence the reason for European scopes that are fixed power. 8X56 would be 8mm divided by 56mm equals an exit pupil of 7.
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