Thanks guys!
Originally posted by eaglem I wasn't aware Sigma made a Pentax mounting for the Sigma 180mm EX DG macro
Yes, they made two versions...
a DG and a non DG (older) version...
Sigma 180mm F3.5 APO EX DG IF Macro Lens Reviews - Sigma Lenses - Pentax Lens Review Database
They are pretty hard to find though ...
It's considered as the "poor man's Pentax FA*200mm Macro" ;-)
I was lucky enough to own 3 copies of that lens (2 DG and 1 non-DG), this is the 3rd copy... I sold my 1st copy because I wasn't using it enough, and wanted to finance another purchase, and I regretted it... so when I saw one on eBay at a reasonable price, I jumped on it...
if you can find one at a good price, and if you like macro photo, buy it !