The Tamron SP AF10-24mm f/3.5 -4.5 Di II is an ultra wide-angle zoom lens. Di II means that is designed for exclusive use on digital SLR cameras with smaller-size imagers (APS-C/DX). Boasting a focal length range of 10 - 24mm, (the 35mm equivalent of 16mm to 37mm) this lens has a varied range of applications for creating dramatic images as it features both ultra-wide and semi-wide angle settings. The close focusing capability of this lens enables image capture with an exaggerated perspective at the 10mm ultra wide-angle end or with a maximum magnification ratio of 1:5 at the 24mm semi-wide-angle. It has Micro Motor to ensure precise and smooth auto focusing. Note: Tamron SP AF10-24mm f/3.5 -4.5 Di II is not designed for conventional cameras or digital cameras with image sensors larger than 24mm x 16mm Captures Ideal Range of Focal Lengths With D-SLRs Since the size of 35mm film format is larger than the image sensor generally used in D-SLRs, a digital camera captures a narrower angle