Sigma 50-200mm OS HSM?
which camera do you currently have? If it's a K100D/K110D or earlier, hsm/sdm will not work and you will have a manual focus lens. K100D super, K10D (with firmware update 1.30 if I'm not mistaken), K200d and newer are OK.
Pentax K100D + DA18-55ALII + DA55-300
Pentax K5 + FA31Ltd + M50/1.7 + DFA100WR + M120/2.8 (+ DA18-55WR at occasion)
http://www.flickr.com/photos/greypoint/sets/72157625653119793/
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372 posts
16 years
sussex