Truly wide and truly fast, the Sigma SA mount Sigma 20mm f/1.4 DG HSM Art Lens SA Mountis a member of the venerable Art series of Global Vision lenses from Sigma 20mm f/1.4 DG HSM Art Lens SA Mountand pairs a sophisticated optical design with a robust physical construction. Comprised of 15 elements in 11 groups, the lens design includes two "F" Low Dispersion (FLD) elements, five Special Low Dispersion (SLD) elements, and two aspherical elements to significantly reduce chromatic and spherical aberrations, as well as limit distortion for clean, sharp, and evenly illuminated imagery. A Super Multi-Layer Coating has also been applied to minimize surface reflections, flare, and ghosting for increased contrast and color accuracy. The wide focal length and consistent image quality make this lens especially suitable for landscape, interior, architectural, and astrophotography applications, while the fast f/1.4 maximum aperture deems it ideal for natural and low-light shooting.

Complementing the optical performance is an equally adept Hyper Sonic Motor, which provides fast, smooth, and near-silent autofocus performance. This focusing motor also enables full-time manual focus override at any time just by rotating the focus ring for refined manual control and focusing as close as 10.9". The lens barrel is constructed using a Thermally Stable Composite material, which supports working in a wide variety of temperatures and conditions, and the lens mount is constructed from brass for long-term durability and mounting accuracy. Additionally, this lens is also compatible with the optional Sigma USB Dock for fine-tuned control over focusing parameters and other lens characteristics.

SA Mount Lens/Full-Frame Format    Aperture Range: f/1.4 to f/16    Two FLD Elements and Five SLD Elements    Two Aspherical Elements    Super Multi-Layer Coating    Hyper Sonic AF Motor, Manual Override    Rounded 9-Blade Diaphragm    TSC Material, Brass Bayonet Mount    Built-In Petal-Shaped Lens Hood    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.

Prime wide-angle 20mm f/1.4 lens is designed for full-frame sensors and can also be used with APS-C models where it will provide a 30mm equivalent focal length.

Fast f/1.4 maximum aperture is well-suited for working in low-light conditions and also provides greater control over the focus position when using shallow depth of field techniques.

Two FLD, five SLD, and two aspherical elements have been incorporated within the lens design to correct for chromatic aberrations throughout the entire focusing range and help to ensure high image sharpness, clarity, and contrast regardless of focus point or aperture setting. This optical design also helps to control distortion and limit vignetting.

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.

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.

Fixed petal-shaped lens hood helps to reduce lens flare when working in strong lighting conditions and also offers some protection to the front element of the lens.

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 bayonet mount is constructed from brass for ensured accuracy and durability.

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. I have the Nikon D750 and want to see if anyone has used this Sigma lens with that camera and if they are fully compatible?

A: Thank you for your interest in Sigma products. The 20mm f/1.4 DG HSM Art Lens for Nikon F is compatible with the Nikon D750.

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. This is a heavy lens, how do the sony a7iii contacts hold up with 2lbs hanging off it?

A: There have been no reports of any damage caused by this lens.

Q: 4. Will the Lee Filters sw150 Mark II fit this lens? I will buy this lens if there is a filter system to fit it.

A: Lens was a gift for my son.

Q: 5. 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: 6. Can this lens be used on a cinema rig, with nun's knickers & a matte box (so you can use filters) or will it vignette?

A: Yes you can use this in a Cinema Rig with little to no vignetting.

Q: 7. will it work on a canon 50D?

A: Thank you for your interest in Sigma products. The 20mm f/1.4 DG HSM Art Lens for Canon EF is compatible with the Canon 50D.

Q: 8. 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: 9. 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: 10. can we use LEE filter for this lens?

A: I have heard of NO firm making any add on filters for this item. Realize, it has a 94.5 degree field of view and is 85 mm! Unless you wish to make some kind of slip on thing there is nothing yet. Still, this is one of the best lenses I have gotten and I have most of the Nikon and Sigma catalogs!