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Anonymous File :-(, x)
>>56195 Zoom lenses usually have smaller apertures, slightly more geometric and chromatic distortions and slightly less sharpness than prime lenses of comparable focal lengths and quality. Gotta pay something for the versatility.
However, don't listen to prime junkies who think that all zoom lenses suck. Even quite bad distortions can be easily corrected in photoshop, so that leaves only sharpness and aperture. For more expensive lenses (say, $300+), sharpness isn't much of an issue too - they are all more than enough for a 10MP sensor if used correctly. So that leaves only aperture, and while wider aperture is very good, it doesn't always outweigh the lack of zoom.
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