I have a 450D at the moment, but was thinking of upgrading to a 550D or possibly consider a 7D but thats a bit pricey (imo). I'd just like to get good quality images, I have a 75-300 f/4-5.6 III USM which is fine but the images aren't top quality. The extra reach of the 400 would be good but how would it compare to an image at 200 from a 70-200 F2.8 ?
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