Quote:
Originally Posted by rowan
Sounds like you're asking about 100/200mm primes and a 70-300mm zoom? What exactly are you wanting to know, whether a zoom will offer you the same quality as a prime? For all intents and purposes, unless you're an anal pixel peeper (poring over your 20 megapixel images at 100% zoom looking for 5 pixel wide lens imperfections) or the zoom lens has a bad design there's really not a huge difference.
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the big difference is how much light comes into the lens in low light situation for focus.. a 200mm has a bigger front element than the 70-300 and will allow more light to fall onto the sensor... hence easier to focus in low light. also most variable stop zooms have a 1/2 stop light fall off in the zoom