The Sigma SA mount Sigma 50mm f/1.4 DG HSM Art Lens for SA Mountis 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.

Aperture Range: f/1.4 to f/16    One Molded Glass Aspherical Element    Three Special Low Dispersion Elements    Super Multi-Layer Coating    Floating System & Large Diameter Design    Hyper Sonic AF Motor    Rounded Nine-Blade Diaphragm    Thermally Stable Composite Material    Brass Bayonet Mount    Compatible with Sigma USB Dock

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.

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.

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.

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.

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.

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.

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.

• 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.

Related Questions and Answers

Q: 1. Will this work for video with a camera that doesn't have image stabilization either? I'm worried about the micro-jitters. Telephoto lenses tend to pronounce vibrations. I'm always on a monopod, tripod, or gimbal for reference.

A: Yes it will.

Q: 2. Is this lens compatible with Sony a7 series via the Metabones EF to e-mount adapter Mk III?

A: Yes but get the Sigma adapter so you can take advantage of eye focus. Love the quality

Q: 3. I am looking for a wide angle to use primarily for night (star, trails and Milky Way) photography. Has anyone tried this lens for that purpose?Thank you,

A: I bought this lens exclusively for night photography. It was very sub-standard. Most of the reviews were glowing, but as an astrophotographer I found it to be one of the worst I'd ever used. Wide open to f1/4 or even to f2.5 it gave me VERY bad stars around the edges of the frame all the way into about 1/3 of the image all around. The stars in those areas looked like large comets. You had to stop it down to about f4 to see any noticeable improvement. Also, I like to put a star filter over my lenses to create the starburst effect on my shots, but since this lens protrudes out the front of the barrel you can't put filters on it. I returned the lens.Oh, I have seen a few good reviews on this lens for astrophotography. I should note that I DO NOT just look at my photos on a computer screen. I sell my work, usually in 20 x30 prints, but sometimes in VERY LARGE (wall mural) sizes. So I CAN'T have comets for stars on the edges of my photos; they will be huge blobs when enlarged. I ended up buying the Nikon 20mm f1.8. It's not bad, even wide open.

Q: 4. What pouch fits this lens?

A: Sigma 20mm f/1.4 DG HSM Art Lens for Canon EF dimensions are 3.57 x 5.11" / 90.7 x 129.8 mm. This lens comes with it's own padded case in the box. If you prefer a neoprene lens pouch the following option will fit the lens with the lenshood on reverse. LensCoat LensPouch (Medium Wide, Black) BH #LELCLPMWBK • MFR #LCLPMWBK https://bhpho.to/3Vhexeb

Q: 5. How does the image quality of this lens compare to that of Nikon 20mm 1.8?

A: This lens has a much better image quality overall then the 1.8 version from Nikon. It really does produce a spectacular image that will wow you. Sigma really nailed the Art series. I am a loyal Nikon shooter and this is the only non Nikon lens in my bag, but very glad I bought it.

Q: 6. Has anyone had any issues with the Sigma 20mm 1.4 on the Canon 5D Mark IV?

A: I haven't so far. I've had it for about 4 months now I think. It's great to minimize the crop factor for the 4K video mode and works out to be almost 35mm when in 4K video which is my primary focal length I shoot at.

Q: 7. How's the focus on this lens? I've heard that it's hard to focus. Looking for a good wide angle lens.

A: Both auto focus and manual focus works fine on my 20mm, f/1.4

Q: 8. Is the manual focus on this lens mechanical or fly by wire?

A: The lens is Both Auto Focus and Manual Focus by rotating the large Focus ring up front.

Q: 9. Is there any autofocus noise when using with mc-11 like the 18-35 has?

A: I use this lens with a 5D Mark III. I've experienced virtually no sound as this lens acquires focus. This lens is excellent - focus is sharp, colors true and low light performance is as good as any I've used.

Q: 10. I'm looking at this lens for video production, how is the focus breathing with the lens? Is it minor or fairly noticeable?

A: it does but its minor imo