Review Sigma 105 mm/2.8 EX DG OS HSM Macro (C APS-C)
The Sigma 105 mm 2.8 OS Macro has entered the market in the summer of 2011. A big difference with the previous model is the built-in image stabilization. The focal length of 105 mm is sometimes a bit tight on a full-frame camera in macro photography; you are often working in your own shadows then. In this regard, a 150 mm or a 180 mm macro is preferred. A focal length of 105 mm is very useful as a portrait lens in many cases. And if you enjoy working with primes, the Sigma 105 mm 2.8 Macro OS is a logical step after a 50 mm standard lens. The actual price at the moment is much lower than the suggested retail price at its introduction, which makes this Sigma macro lens even more attractive.
Construction and Autofocus
The lens is made of a high-quality type of plastic, and the mount is made of metal. Sigma fortunately does not use the delicate hammered motif anymore. The focus ring turns completely free of play and with just the right friction. The stroke is about 180 degrees. The whole feels very solid and the lens is supplied with two large lens hoods: one to use with a full-frame camera and one to use with an APS-C camera. The AF is driven by a USM motor.
Focusing with a Canon 5D MK2 is not very quick; from 15 meters to 1.5 meters in 0.32 seconds. That is a fraction more than the USM-powered Canon 100 mm 2.8 IS Macro. Focusing makes some noise and in low contrast, the AF sometimes shows seeking behavior.