This ultra-wide zoom lens has a wide angle of view from 102.4 - 63.8 degrees and it is exclusive to digital SLR cameras. SLD glass elements effectively compensate color aberration. Aspherical lenses provide maximum correction for distortion and various aberrations; high image quality is displayed throughout the entire zoom range. Equipped with HSM, this lens makes fast AF speeds and quiet shooting a reality, and it is also capable of full-time manual focus. It has a minimum focusing distance of 24cm (9.4�) at all focal lengths. It is also equipped with an integral Petal-type hood to block out extraneous light. Ultra-wide zoom lens 10-20mm F4-5.6 EX DC HSM lens allows enjoyment of super wide-angle photography and it is a very powerful tool for indoor shooting and landscape photography with APS-C size image sensors of digital SLR cameras.Wide angle of view 102.4-63.8 degrees offers the photographer greater freedom of expression. Note: The angle of view changes depending on which camera model the lens is attached to. Most Appropriate Coating for Digital SLR Cameras The new multi layer lens coating and lens design reduce flare and ghost, which is a common problem with digital cameras and also creates an optimum color balance through the entire zoom range. The best possible correction of aberrations Three SLD (Special Low Dispersion) glass elements are employed for effective compensation of color aberration, which is a common problem with super-wide angle lenses. One piece of glass mold and two hybrid aspherical lenses, offer excellent correction for distortion, as well as all types of aberration. Inner focus system This lens incorporates an internal focusing system, which eliminates front lens rotation allowing the use of a Petal-type Hood and also minimize fluctuation of aberration caused by focusing system. Minimum focusing distance This lens has a minimum focusing distance of 24cm (9.4�) throughout the entire zoom range.