05-18-2012, 07:34 PM
A Sigma 20/1.8 I wager. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='' /> But seriously, the STF looks like a great lens even though I would've probably preferred the 135/1.8 ZA. YMMV.