This is a wonderful macro lens that rivals the Nikon and Canon big guns for sharpness. Great value and the built in optical stabilizer is perfect when using it as a portrait lens, which it also excels at.

Super sharp!! Great lens all around. It does have a clunking sound when the lens is off the camera body but this is normal and does not mean the OS is broken.

One of the most recent arrivals on the macro scene, the Sigma 105mm f/2.8 EX DG OS HSM lens may be one of the more pricey options for this focal length, but with its EX designation Sigma promises that both the lens' build and optical qualities befit the demands of the professional user.

A ruggedly constructed, large-aperture, full-frame, image-stabilized, 1:1 close-up lens, this medium telephoto prime ($970, street) converts up to about 150mm on Sigma's SD1, as well as on most DSLR cameras with APS-C sensors.Its attractions include a nonrotating barrel suitable for lens-mounted...

As a manufacturer of a wide range of lenses from 8-800mm, Sigma's line also includes true macro lenses for extreme close-up photography. Both of the current models will produce a full life-size rendition of the subject without accessories: the AF...

I recommend this lens as an excellent macro, not as a tele. As any younger Sigma it needs service to be adjusted individually to one's camera. Therefore it has to be sent to Sigma together with the camera. They will fine-tune the lens within one week without charge.

Superb macro lens for a very; very attractive price; fast and accurate AF in macro range; optical stabilization

Needs service befor used for the first time; no aperture ring; AF has some weekness when used as normal tele (not as macro

One of the most recent arrivals on the macro scene, the Sigma 105mm f/2.8 EX DG OS HSM lens may be one of the more pricey options for this focal length, but with its EX designation Sigma promises that both the lens' build and optical qualities befit the demands of the professional user.

Dive into a whole new world of photography with an affordable third-party macro lens such as this Sigma model. The Sigma 105mm f/2.8 is available in Canon, Nikon, Sony and Sigma mounts, fitting full-frame and APS-C D-SLRs.

This large aperture medium telephoto macro lens offers advanced performance of close-up photography. Sigma's own proprietary OS (Optical Stabilizer) system enables handheld close-up photography.

Canon lists six lenses on their site under the macro section and Nikon lists 10, so is it even worth looking into 3rd party companies like Sigma In the recent past, the popular answer was no, but as time keeps on ticking, the 3rd party companies are really upping their game.