This Sigma APO 70-200mm F2.8 EX DG Macro HSM II Lens for SLR mounts features a F2.8 constant maximum aperture. Having HSM autofocus with a full-time manual focussing option, this lens is suitable for wildlife, nature, sports and wedding photography. Giving any photographer the chance to create bokeh in order to enable the subjects to stand out of the background, this 1350 g lens measures 8.7 cm in diameter.