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Forum: Pentax SLR Lens Discussion
07-02-2015, 09:11 AM
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The only true fixed aperture lens you are likely to run into (meaning it really only has one aperture) is a telephoto mirror lens, like a 500mm f/8. Anything else talking about fixed aperture is a zoom lens (not a prime) and it is telling you the maximum aperture stays the same at any focal length of the zoom (which is hard, because it is a ratio). While fixed aperture zooms have an obvious advantage in terms of speed, don't assume a variable aperture zoom is inferior overall. Because it is easier to design a variable aperture zoom, they can be just as good or even superior optically. (Read lots of reviews of whatever you are considering.)
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