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#1
03-04-12, 07:58 PM
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Constant apertures
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? Confused 
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