Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF The Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF is a fast standard-length prime designed to achieve high optical performance through the incorporation of both three Special Low Dispersion glass elements and one molded glass aspherical element. These elements, coupled with an advanced optical design, work to minimize sagittal coma flare and chromatic aberrations in order to provide high image sharpness and clarity. The Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF lens' large diameter and floating system also help to correct for vignetting to ensure maintained peripheral brightness. Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF has a Super Multi Coating applied to lens elements, too, to reduce flare and ghosting for higher contrast and color fidelity. The Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF has a Hyper Sonic AF Motor, along with an optimized AF algorithm, produces quiet, smooth, and fast autofocus performance that benefits this lens' use in a wide variety of situations. This Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF also permits full-time manual focusing control for refined precision by simply turning the focus ring at any time. Sigma Global Vision - Art As part of the Art line within Sigma's Global Vision series, this Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF is designed to achieve truly notable optical performance and is ideally suited for creative and artistic applications. Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF has a molded glass Aspherical Element This Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF has been designed using an advanced optical structure to achieve both high resolution and sharpness along with an aesthetic out-of-focus quality for greater subject separation. Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF has a molded glass aspherical element which corrects for sagittal coma flare and enables full use of the fast f/1.4 maximum aperture with maintained sharpness and clarity. This Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF also works to minimize vignetting, color blur, and other distortions help to produce natural and pleasing bokeh for selective focus and shallow depth of field techniques. By reducing these aberrations, this Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF is also well-suited to astrophotography or other situations with point-light sources due to its ability to suppress blur near the edges of the frame. Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF has Special Low Dispersion Glass Elements The Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF has three SLD (Special Low Dispersion) glass elements which have been incorporated within the lens design to correct for axial chromatic aberration throughout the entire focusing range. This helps to ensure maintained image sharpness, clarity, and contrast regardless of focus point or aperture setting. Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF is a large diameter Lens In designing the Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF with a large 85.4mm diameter, and placing the widest elements within the front group, greater peripheral brightness is more easily attained when working with larger apertures. This design also lends itself to minimizing vignetting throughout the aperture range for greater clarity and detail across the image frame. Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF has a Super Multi-Layer Coating A Super Multi-Layer Coating has been applied to the Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF elements in order to minimize lens flare and ghosting and contribute to producing contrast-rich and color-neutral imagery, even in backlit conditions. Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF has a Floating System By employing a floating system on the Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF, the distance between glass elements is adjusted during focusing in order to limit the amount of lens movement required when shooting. This floating system helps to realize a minimum focusing distance of 1.3' with a maximum magnification of 1:5.6. Additionally, this Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF also contributes to high detail rendering capabilities throughout the entire focusing range. Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF has a Hyper Sonic AF Motor The Sigma 50mm f/1.4 DG HSM Art Lens for Canon EF has an integrated HSM (Hyper Sonic Motor) which realizes quick and quiet autofocusing, which is further complemented by an optimized AF algorithm to produce smoother focusing performance. The HSM also permits full-time manual focus control simply by rotating the focus ring at any time.