I've already posted this on DPReview's Pentax Forum (my first post there) so my apologies if you've already seen this thread.
I've just spent a few hours shooting with the Sigma Macro 70mm f/2.8 EX DG lens and I am mighty impressed with the rendering this lens offers. As with most quality macro lenses, the Sigma is razor-sharp but what really impresses me with it is the quality of the bokeh! My girlfriend (AmDamJayne) shoots her macros with a prized manual-focus Lester Dine/Kiron 105mm f/2.8 and the Sigma's OOF rendering is, in my opinion, every bit as good as the Lester Dine (maybe even a bit smoother) and noticeably smoother than my copy of the Pentax DFA 100 f/2.8 macro lens.
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If you're in the market for a macro lens, give this Sigma serious consideration.
Last edited by pawzitiv; 08-07-2007 at 10:00 PM.