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I use my 50mm with Canon 400D, this lens is very sharp from f2.8 - f3.5 and excellent from f3.5 - f11. It is sharp from f1.8 - f2.8 but I can not say this for faster apertures but it is still usable. It is very compact and easy to use. Autofocus is really good and very silent, thanks to USM. I think it is the best choice of Canon's 50mm lenses, I used f1.8 one but it looks like a toy and I don't like its build quality. Its autofocus is also worse than this. The f1.2 one is too expensive for most of the photographers.
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