The Canon EF mount Sigma 50mm f/1.4 DG HSM Lens 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 lens‎'‎ large diameter and floating system also help to correct for vignetting to ensure maintained peripheral brightness‎.‎ A Super Multi Coating has been applied to lens elements‎,‎ too‎,‎ to reduce flare and ghosting for higher contrast and color fidelity‎.‎

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 AF motor 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 lens‎'‎ is designed to achieve truly notable optical performance and is ideally suited for creative and artistic applications‎.‎

Molded Glass Aspherical Element

This lens 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.‎ A molded glass aspherical element corrects for sagittal coma flare and enables full use of the fast f/1.4 maximum aperture with maintained sharpness and clarity‎.‎ This design 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 lens 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.‎

Special Low Dispersion Glass Elements

Three SLD ‎(‎Special Low Dispersion‎)‎ glass elements 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.‎

Large Diameter Lens

In designing the lens 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.‎

Super Multi‎-Layer Coating

A Super Multi‎-Layer Coating has been applied to lens elements in order to minimize lens flare and ghosting and contribute to producing contrast‎-rich and color‎-neutral imagery‎,‎ even in backlit conditions‎.‎

Floating System

By employing a floating system‎,‎ 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 design also contributes to high detail rendering capabilities throughout the entire focusing range‎.‎

Hyper Sonic AF Motor

The integrated HSM ‎(‎Hyper Sonic Motor‎)‎ 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.‎

Other Lens Features

• A rounded nine‎-blade diaphragm helps to produce an attractive out‎-of‎-focus quality‎.‎
• The lens is constructed using a Thermally Stable Composite ‎(‎TSC‎)‎ material‎,‎ along with traditional metals‎,‎ for greater precision and use in wide temperature variations‎.‎ The outside of the lens barrel is also engraved with the year of production‎.‎
• The bayonet mount is constructed from brass for ensured accuracy and durability‎.‎
• The included lens hood is fitted with a rubber connection for a secure fit‎.‎
• This lens is compatible with the optional Sigma USB Dock for fine‎-tuning different lens characteristics and updating its firmware‎.‎