The Tamron AF 70-300mm f/4-5.6 Di LD Macro lens is a quality compact ultra tele zoom lens which covers the 70mm to 300mm telephoto range, with a maximum magnification ratio of 1:2 at the tele end. This lens delivers ultimate handling ease and portability in the field due to its lightweight size and mechanical operation. Best suited for shooting outdoors to make full use of the real telephoto of 300mm as well as providing diversity in portraiture using the medium focal length ranges of 70mm to 135mm. Di (Digitally Integrated Design): is a designation Tamron puts on lenses featuring optical systems designed to meet the performance characteristics of digital SLR cameras.