This Sigma APO 300mm f/2.8 EX is an ultra compact Apochromatic telephoto lens with a fast f/2.8 maximum aperture, and incorporates two Extraordinary L

This Sigma APO 300mm f/2.8 EX is an ultra compact Apochromatic telephoto lens with a fast f/2.8 maximum aperture, and incorporates two Extraordinary Low Dispersion glass elements to reduce chromatic aberration to a minimum. It incorporates internal focusing which enables responsive and fast autofocus speed. A detachable tripod socket and rotatable drop in filter holder are provided.