| I just got the Sigma 70-200. I don't have experience with the other lenses you mention, but as a basis for comparison I've been using the Digital Zuiko (Olympus) 50-200 for the past three years. The Zuiko is one of the best zooms ever made in terms of build, wide open IQ, auto focus accuracy, etc. From the moment I put the Sigma on my K200D, I was impressed. The HSM is quiet, very fast. It is totally useable wide open, even better at about F4.0. I wouldn't hesitate unless you had to have weather sealing. Save some money and own a great lens with a 4 year warranty. |