Summary: This is and old version of the Sigma Macro 105mm. I looked for it in several second hand stores and finally found the only one here. It works perfectly and the shipment was quick and secure. Thats important when you are purchasing expensive and delicate camera equipment.
Excerpt: I purchased this lens to shoot wedding rings with great detail. It will certainly do the job. The image stabilization will keep from from bring a tripod. I am very pleased with this lens and consider a good lens for the price (under $700).
Pros: Durable, Fast / accurate auto-focus, Strong Construction
Excerpt: I am a Hobby photographer and have wanted a Macro lens for a long time. B&H's price and Sigma's great lens allowed me to obtain one. It is proving to be one of my best lens. Very sharp and clear photos. The only minus to it is that it is under rated.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Nice Bokeh, Strong Construction
Summary: I purchased this lens used from a seller on Amazon.com. This being my very first used lens purchase I can tell you that I was filled with doubts about it's quality. After it's receipt all doubts were washed away.
Summary: This lens is great for 1:1 macro, it's true macro pretty much. You'll most likely have to get a tripod for real close up shots, but wow! It's sharp at around f4 and f5.6. I have also been using this a portrait lens and the photos are coming out great as well!
Summary: My teachers in my college photography classes always harped to NEVER use third-party lenses for cameras. But honestly, I'm not going to spend $1000 (give or take) on the Nikon 105mm f/2.8 when I can get this Sigma brand for around $480. I use it on my D90, and I couldn't be more in love.
Conclusion: Bought this on a lark about two years ago from KEH, had some extra cash and thought it would be fun to try macro photography. I had shot with the Canon 100mm 2.8 USM and the MP-E 65mm ... but I didn't have that kind of extra cash.
Pros: Extremely sharp even when wide open, good build quality, great bokeh, color, contrast, etc.
Cons: Autofocus is crap but who uses autofocus on a macro lens?
Summary: Ken Rockwell said in his review of the D7000 that this lens didn't fit. Lies. Got it two days ago and have been dropping my jaw ever since. I'll put some pictures up that I took today of my wife's and my eyes. Go check them out. FYI, tripod is almost necessary in every situation.