Tu Trang wrote: Hi there, I plan to buy a used Sigma 70-200 f2.8 APO HSM at USD400 for my EOS50. Anyone out there can give me your recommendations about this lens ? Is it fully compatible? Thanks. Trang Nguyen ----------------------------------------------- I have it and love it. Not as fast to AF as the Canon but not slow either and not noticeable unless you have the Canon and Sima side by side and go between the two to compare. The AF is quiet and lens is sharp at all apertures and slightly sharper than the Canon (non-IS) when at 200mm at F2.8. I compared this using slides and have the data to back this up so it is not hearsay. Also, the Sigma glass is slightly warm compared to the Canon which has a neutral tone.
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