‘This is a new zoom lens for 35mm full-frame sensor SLRs that offer the quality of a fixed focal length at various angles of view’ – Sigma
Constant f2 maximum aperture – Slightly faster than the normal 24-70mm f2.8 zoom lenses, with the potential to blur backgrounds a bit more. 28cm minimum focus distance – Good for close-up shots. No optical stabilisation You can change the mount (e.g. from Canon to Nikon) Huge 82mm filter mount Weighs 940g