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fence
!!POey2hdozCZ
here's a real opinion:
zoom on a camera lens is basically a system of compromises. the wider a range of focal lengths a single lens covers, the more you have to compromise image quality. ergo, you can read this as: primes are the best, followed by pro zooms that cover only a limited range (wide, normal, telephoto), followed by consumer zooms that cover the same range but smaller apertures, with "super zooms" (18-200 dx, 28-300 35mm) coming in dead last.
this isn't an absolute guaranteed rule (nikon's new 14-24 is sharper than pretty much all of their wide primes, etc), but it's a good rule of thumb.
ergo, the 18-200 sucks for everything except extreme versatility.
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