I had a Sigma 400/5.6 APO Macro for a month. I returned it because it would sometimes report f2.8 on a Super Program. I thought it might be a defective lens. Now I believe it was a problem with Sigma chips in general. Some of them do not report the aperture accurately with older Pentax bodies.
I used it primarily in autofocus on a PZ1p, shooting baseball at night, wide open at f5.6 with Fuji 800 print film. It performed very well, actually much better than I expected. If my only criteria was optical quality and build quality, I would buy another Sigma 400/5.6 APO Macro without hesitation. My only complaint other than the chip problem was the short focus throw, which made fine-tuning difficult when focusing manually. Although it is a large lens, the tripod collar makes it fairly easy to handle, even on a monopod. It has a decent built-in hood, which is a plus. -- John Mustarde - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
