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03-04-12, 07:58 PM
Join Date: Aug 2010
This one has been puzzling me for a while.
There are zoom lenses out there that have a constant aperture throughout the focal range so given that the f number is actually a ratio of the focal length how can this be?
Does the aperture close down as the focal length decreases? This would seem daft as why not have a superfast aperture at the widest focal length instead of a relatively slower one?
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