The extreme compact and lightweight Tamron AF28-300mm f/3.5-6.3 XR Di LD Aspherical Macro lens offers a 10.7x zoom when used on an APS-C DSLR. This is an all-in-one zoom lens rendering an equivalent 43-465mm lens on a full-frame DSLR or a 35mm film SLR. Its designated Di lens properties allow it to function on full-frame and APS-C DSLR and film SLRs. Promising award-winning image quality, this lens is optimized through use of a combination of XR (Extra Refractive Index) and LD (low dispersion) glass element. The internal focusing contributes to responsiveness and preserves constant lens barrel length and Macro focusing brings small subjects in to view crisply.