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#2
10-31-2005, 05:33 PM
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Very basically, it collects more light. The higher the scope power, the less light it transmitts. That's why a 3X scope can get by without a large objective lense, but a 9X needs a large one. The proliferation of 50+mm scopes is an outgrowth of this optical fact, allowing even more light on higher power scopes than with smaller objectives.
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