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Summicrons F-value?
A question for the experts. I understand that a lens f-value equals the focal length divided by the diameter of the lens opening. To accommodate a larger lens opening a lens needs a large enough front lens and that's why the front lens of an f/1.4 50mm lens is larger than an f/2. Why then is the diameter of the front lens of my v4 35 mm summicron 35% larger than the one of the v1 summicron, roughly 27 mm vs. 20 mm?
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