An ultrawide Leica L-mount prime, the Sigma 20mm f/1.4 DG DN Art Lens offers incredible imaging performance from corner to corner, with a large maximum aperture that makes it ideal for use in low-light environments, particularly under dark skies where its new features are especially useful. Always an excellent choice for landscape and architecture, this lens is equipped with newly updated functions especially useful for astrophotographers.

Combining an optical design with in-camera corrections that keep distortion under control, this lens offers an extremely well-controlled sagittal coma flare that yields pin-point stars from edge to edge. Additionally, a new Manual Focus Lock (MFL) switch disables the focus ring, ensuring that focus never changes, even after hours of shooting under chilly, dark skies. The lens has also been developed to accept 82mm front filters, a rarity on ultrawide primes, and another unique feature includes a rear filter holder, which accommodates sheet filters for various creative effects.

L-Mount Lens/Full Frame Format    Aperture Range: f/1.4 to f/16    Two SLD Elements    Three Aspherical Elements    Super Multilayer Coating    Stepping AF Motor, MFL Switch    Rounded 11-Blade Diaphragm    82mm Front Filter Thread    Rear Filter Holder    Durable Brass Bayonet Mount

• 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 format Leica L-mount mirrorless cameras and can also be used with APS-C models where it provides a 30mm equivalent focal length.
• Fast f/1.4 maximum aperture is well-suited for working in low-light conditions and provides greater control over the focus position when using shallow depth of field techniques.
• Two SLD and three aspherical elements have been incorporated within the lens design to correct for chromatic aberrations throughout the entire focusing range and to ensure exceptional clarity and contrast. This optical design also helps to control distortion and limit vignetting.
• Employs a concave double-sided aspherical element, which provides outstanding edge-to-edge sharpness and optical performance.
• Optimized for astrophotography, the lens offers extremely well-controlled sagittal coma flare and limits ghosting.
• A Super Multilayer Coating has been applied to lens elements to minimize lens flare while producing contrast-rich and color-neutral imagery, even in backlit conditions.
• Inner focus system powered by precise STM stepping motor provides high-speed autofocus and near-silent operation.
• Optimized for astrophotography, a new MFL (Manual Focus Lock) switch disables the focus ring, ensuring that focus never changes, even after hours of shooting under chilly, dark skies.
• Aperture ring with click switch and lock switch prevents accidental aperture changes.
• A rounded eleven-blade diaphragm helps to produce an attractive out-of-focus quality.
• Petal-shaped lens hood helps to reduce lens flare when working in strong lighting conditions and offers some protection to the front element of the lens.
• 82mm front filter threads and rear filter holder for sheet-type filters.
• Curved lip at the front of the lens keeps an optional lens heater from slipping in front of the lens.
• Brass bayonet mount for ensured precision and durability.
• Compatible with optional UD-11 USB Dock for Leica L, which enables fine-tuning different lens characteristics and updating its firmware.

Related Questions and Answers

Q: 1. Can I use a mattebox with that lens diameter?

A: The front of the Sigma 20mm f/1.4 DG HSM Art Lens for Canon EF is 3.57" / 90.7 mm in diameter. As long as you have a matte box that can fit over that, it will work.

Q: 2. Is it likely for an 82mm Variable ND to vignette on this lens?

A: As long as you do not have an overly thick 82mm Variable ND, it should not vignette on the Sigma 20mm f/1.4 DG DN Art Lens for Sony E.

Q: 3. If the lens with hood is just 4.4" then it not a long lens. Is it true the total length is just 4.4"?

A: The Sigma 20mm f/1.4 DG HSM Art Lens for Leica L measures 6 inches long without the hood. The lens hood will add another couple of inches.

Q: 4. 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: 5. Is the focus linear? for pulling focus on manual mode in video makes a huge difference

A: Tested on an Sony body, the focus is Linear. Linear focus gives you more controll over small focus pulls.

Q: 6. Does this lens have image stabilization?

A: Yes... I use a Sony A7ii with this lens and it is compatible with Sonys image Stabilization.

Q: 7. does this lens fit for canon 1Dmark3?

A: Yes, the lens is compatible with a Canon 1D Mark III.

Q: 8. Can this be used with sony a7r iva directly without an adaptor?

A: Yes, the Sony A7R IVA will accept the Sigma 20mm f/1.4 DG HSM Art Lens for Sony E directly without the need of an adapter.

Q: 9. Is a filter holder available yet for this lens, such as a NiSi or Kase?

A: As of 07/21/23, there is no filter holder available yet for the Sigma 14mm f/1.4 DG DN Art Lens.

Q: 10. I'm struggling to find a 2.0 or faster, truly wide-angle lens for night photography that also has full sensor coverage for my Sony a7RII. This Sigma lens seems to meet all my needs when paired with the MC-11 adapter, and so I ask... Has anyone tried this lens via the MC-11 adapter on a Sony a7RII? Did you have any problems with either auto or manual focusing?

A: This lens will be fully compatible on the Sony A7R II with the Sigma MC-11 adapter.