Optical construction utilizes 21 elements, including one SLD and three FLD elements, as well as Sigma’s Super Multi-Layer Coating to help reduce ghosting and flare, all in a fairly large 171mm long barrel that weighs nearly 1.5kg. Autofocus is powered by Sigma’s HSM motor for quick and quiet performance, and the Sigma 50-100mm f/1.8 A offers full-time manual focus override.
The long lens barrel provides plenty of room for large focus and zoom rings, and its internal focusing and zoom systems ensure that the lens remains the same length during operation. A rotating tripod collar provides convenient use with tripods and monopods,
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