"New series of SP lens that is optimized to make the most of the superior imaging performance delivered by the latest advancements in digital photography. Sporting a totally revamped external appearance, the Tamron SP 45mm F/1.8 Di VC USD Lens provides the ultimate in functionality and operation. The lens is compatible with full-frame DSLR cameras and offer fast apertures and versatile, fixed focal lengths. and it can be used with APS-C format cameras as well Features of the Tamron SP 45mm F/1.8 Di VC USD Lens 1. F/1.8 fast-aperture, fixed focal lens aimed at ultimate performance Optimal use of the latest glass materials, coupled with Tamron's world renowned optical design technology, thoroughly compensated for aberrations of all types to achieve higher resolving power, while fine textures of materials and details are reproduced with subtle tonal gradations. The F/1.8 aperture delivers more light to the viewfinder making it brighter for easier focusing - and more light to the sensor, allowing use even in very dim lighting conditions. In addition, the bokeh (background blur) effect obtained using the F/1.8 fast aperture delivers impressively smooth and soft transition from the main subject to the background. 2. Dynamic close-focusing capability, unprecedented among standard lenses Tamron SP 45mm F/1.8 Di VC USD Lens delivers astonishingly short MOD (Minimum Object Distance) not available from other 45mm standard lenses. Photog|Even when used wide open at F/1.8 aperture, provides outstanding image quality with maximum aberration compensation, thanks to optimal use of sophisticated glass materials and highly advanced optical design|World's first full-frame 45mm focal length with fast F/1.8 maximum aperture and integral VC (Vibration Compensation)|MOD (Minimum Object Distance) of 11.4"", the best-in-class close-focusing capability|eBAND Coating deployed to thoroughly suppress ghosting and flare|High-speed AF with USD (Ultrasonic Silent Drive)|Fluorine coating on the front element repels water and fingerprints|Moisture-resistant construction for shooting outdoors under adverse weather conditions|Circular aperture for enhanced bokeh|Compatibility with Adobe and Silkypix software"