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So it's advisable to go with Sigma?


I prefer the Canon/Nikon glass as to the 'knock-offs'. They are of higher quality and hold their value longer. They are a great alternative to get you into something with better features (for example, 70-200mm f/2.8 from sigma rather than the 70-200mm f/4 from Canon).

Like everything in this world, you get what you way for.

-Todd...