Originally posted by TrailRunner Sigma 400 F/5.6
To the best of my knowledge there are several versions of this lens - the two manual focus versions are to be avoided: optically speaking they are just
atrocious. The Sigma 400mm f/5.6 APO Macro on the other hand is said to be a superb lens optically, physically it is a beast of a lens.
Originally posted by TrailRunner Can anyone speak to this with regards to the K-3? "Lock up your camera"
Canon cameras are more dependent upon electronic communication between the lens/camera than pentax DSLRs are. I have personally never heard of a Lens locking up a Pentax DSLR.