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Dr. Joel M. Hoffman wrote:
Given two lenses, one a prime (say 28mm) and the other a zoom (say 28-75mm) and both with an aperture of f2.8 - - Will the prime be brighter than the zoom because it has fewer lens elements? No. f/2.8 tells you exactly how bright the lens is. (It's almost like the old question about a pound of lead and a pound of feathers - they do both weigh the same.) However, a pound of gold and a pound of feathers do not. |
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