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Sigma reveals 20mm F1.4 DG DN lens for L-mount and E-mount: Digital Photography Review


Sigma has announced the 20mm F1.4 DG DN lens for L-mount and Sony E-mount cameras. This new lens is a mirrorless successor to the company’s 20mm F1.4 DG HSM lens for DSLR camera systems and brings a collection of unique features that make it a particularly intriguing offering for astro and landscape photography.

The lens is constructed of 17 elements in 15 groups, including two Super-Low Dispersion (SLD) elements and three aspherical elements. Included in these specialized element is a pair of double-sided aspherical elements, which the company says contributes to the ‘outstanding optical performance’ across the entire frame.

Other optical features includes Sigma’s Nano Porous Coating (NPC), as well as a water- and oil-repellent coating, although it’s not specified which elements these coatings have been applied to (presumably the front-most element). This lens’ optical construction is notably different from its DSLR counterpart, which is constructed of 15 elements in 11 groups.

The 20mm F1.4 DG DN lens uses an 11-blade rounded aperture diaphragm, an aperture range of F1.4 through to F16, has a minimum focusing distance of 23cm (9.1″) and uses an 82mm front filter thread.

The internal autofocus system is driven via a stepping motor and Sigma says the lens is fully compatible with Sony’s AF assist functions. In addition to the physical focus ring, there’s a physical aperture ring that can be clicked or de-clicked with a dedicated switch.

Other features include a focus mode switch, a rear filter holder and a new Manual Focus Lock (MFL) switch for disabling the focus ring. With astrophotography in mind Sigma has also included, for the first time ever, a Lens Heater Retainer, for users trying to avoid condensation when working in cold conditions. The retainer is a curved lip at the front of the lens designed to keep lens heaters from sliding in front of the lens.

The body of the lens is made from a combination of aluminum and Thermally Stable Composite (TSC). Sigma says the lens is ‘dust- and splash-resistant.’

Between the rear filter holder, the Lens Heater Retainer, the Manual Focus Lock switch and the unique composite used in the body of the lens, it’s clear this lens is designed with astrophotography in mind.

The E-mount version of the lens measures 87.8mm (3.5″) in diameter by 113.2mm in length (4.5″) and weighs 630g (22.2oz). The L-mount version is slightly shorter, but weighs an additional 5G (0.2oz). Each lens comes with a petal-type lens hood, front and rear lens caps, and a guide plate.

The Sigma 20mm F1.4 DG DN lens will be available to purchase in ‘late August 2022 for $899.

SIGMA Announces 20mm F1.4 DG DN | Art, the World’s First and Only 20mm F1.4 Lens Designed Exclusively for Mirrorless

Ronkonkoma, NY – August 8, 2022 – SIGMA Corporation of America, the US subsidiary of SIGMA Corporation (CEO: Kazuto Yamaki. Headquarters: Asao-ku, Kawasaki-shi, Kanagawa, Japan) is pleased to announce the upcoming release of the 20mm F1.4 DG DN | Art, a full-frame, wide-angle prime lens designed exclusively for mirrorless cameras. It is the first and only lens of this specification, joining its predecessor – the 20mm F1.4 DG HSM | Art – as the only 20mm F1.4 lenses available for full-frame platforms.

With superb optical clarity from corner to corner, outstanding build quality with a dust and splash-resistant structure, and new details that consider the needs of discerning users, the new SIGMA 20mm F1.4 DG DN | Art is optimized for astrophotography, while offering performance that makes it an excellent choice for anyone looking for a high-quality, wide-angle prime lens.

In addition to its impressive imaging capabilities and premium Art line features, the 20mm F1.4 DG DN | Art introduces a Manual Focus Lock, which allows the user to set focus manually and lock it in place, especially useful for time-lapse shooting or long exposures. A new Lens Heater Retainer keeps this useful astrophotography weather accessory firmly in place while in use. A Rear Filter Holder provides an opportunity to use rear-mounted filters for various effects without causing distortion or vignetting. And a convenient front filter thread allows users to also utilize commonly available 82mm filters.

The 20mm F1.4 joins the new 24mm F1.4 DG DN and the existing 35mm and 85mm F1.4 DG DN primes designed for full-frame mirrorless cameras.

The new SIGMA 20mm F1.4 DG DN | Art lens will be available for both Sony E-mount and L-Mount systems in the U.S. at SIGMA Authorized Dealers for a retail price of $899 in late August 2022.

Learn more about the SIGMA 20mm F1.4 DG DN | Art:
https://www.sigmaphoto.com/20mm-f1-4-dg-dn-a

The F1.4 series represents the SIGMA Art line, which pursues the highest optical performance and rich expression. The full-frame SIGMA 20mm F1.4 DG DN | Art is a mirrorless version of the SIGMA 20mm F1.4 DG HSM | Art; the one and only lens* with its unique specification of maximum aperture of 1.4 and an ultra-wide angle of 20mm. This lens offers overwhelming optical performance and unlimited potential for ultra wide-angle creativity at a compact physical size. The exceptional F1.4 brightness and the breathtaking sharpness across the entire image even at maximum aperture make this lens the ultimate choice for astrophotography. In nightly darkness and focused to infinity, the 20mm F1.4 DG DN | Art captures stars in the sky as clear, precise pinpoints of light. State-of-the-art optical design and the large, high-precision double-sided aspheric glass front element made it possible to add a front filter thread without any compromises regarding optical performance or size. The addition of other invaluable features such as a rear filter holder and a variety of useful switches further increases the creative possibilities and easy usability of the lens. Its incredible sharpness and very bright aperture, coupled with the compact body and thoughtful features, make the SIGMA 20mm F1.4 DG DN | Art the ultimate lens for astrophotography and an ideal companion for any photographically demanding situation.

* As an AF interchangeable lens for mirrorless cameras that covers 35mm full-frame (as of August 2022, by SIGMA)

Key Features

1. Highest optical performance on a new level

The SIGMA 20mm F1.4 DG DN | Art delivers exceptionally detailed results that easily satisfy the high demands of professional photography and other high-end applications. With 17 glass elements arranged in 15 groups, including two SLD, three aspherical glass elements and the largest class double-sided aspherical glass element in SIGMA’s history, the 20mm F1.4 DG DN | Art rigorously suppresses various optical aberrations such as sagittal coma flare or image distortion to produce highly-detailed images with exceptional sharpness and accuracy from the center to the furthest corners, allowing photographers to make use of the entire field of view afforded by its ultra-wide viewing angle. This ultimate astrophotography lens is the culmination of the unparalleled manufacturing technology of SIGMA’s sole production base in Aizu, Japan, as well as the company’s know-how and experience with large-aperture wide-angle lenses, such as the SIGMA 20mm F1.4 DG HSM | Art, the SIGMA 14mm F1.8 DG HSM | Art and the SIGMA 14-24mm F2.8 DG DN | Art.

2. Designed for perfect results even in the most demanding conditions

SIGMA’s outstanding design and high-precision manufacturing capabilities made it possible to equip the SIGMA 20mm F1.4 DG DN | Art with a front filter thread despite its very large F1.4 aperture and 20mm ultra-wide viewing angle. The lens also comes with a rear filter holder, allowing photographers the freedom to combine multiple filters to suit a huge variety of shooting situations for near-unlimited creative potential at an ultra-wide viewing angle — for example, using a front filter to reduce light pollution and a softening filter on the rear to take impressive photographs of nightly landscapes with star-filled skies. The new MFL (Manual Focus Lock) switch to turn off the focus ring makes it easier to concentrate on the shoot without worrying about accidentally changing the focusing distance. Further, the lens also equips a lens heater retainer, meaning that lens heaters used to prevent internal condensation as the temperature drops on longer night shoots will stay securely attached to the barrel without protruding into the image and causing unsightly vignetting. With its brilliant optical power and its full range of useful features despite its compact and lightweight body, the SIGMA 20mm F1.4 DG DN | Art is the ultimate choice when photographing the night sky.

3. Superb build quality and usability, uncompromising attention to detail

Its dust- and splash-resistant structure*1 and the water- and oil-repellent coating on the front glass element make the SIGMA 20mm F1.4 DG DN | Art safe to use during longer outdoor shoots, especially during the night. Thoughtful features such as a focus mode switch, a customizable AFL*2 button, and an aperture ring lock switch enhance the lens usability. An aperture ring click switch can be used to turn the aperture ring click on and off, allowing photographers to enjoy the sound and feel of the click, as well as smooth aperture operation during video recording. The robust body is built from a combination of aluminum and Thermally Stable Composite (TSC), giving it a sleek finish, and the included petal-shaped lens hood is equipped with a lock mechanism to keep the hood securely fastened to the lens, and the rubberized grip area makes attaching and removing the hood a quick and easy process. Manufactured in Japan with an uncompromising approach towards every single detail, the SIGMA 20mm F1.4 DG DN | Art offers photographers an exceptional experience with high-end results even in the most difficult conditions, thanks to its outstanding optical performance, exceptional build quality perfect for professional use, brilliant and precise ergonomics, and a range of useful features.

*1 Although this construction allows the lens to be used in light rain, it is not the same as being waterproof.
*2 Only on compatible cameras. Available functions may vary depending on the camera used.

Principal specifications
Lens type Prime lens
Focal length 20 mm
Lens mount L-Mount, Sony E
Aperture
Maximum aperture F1.4
Minimum aperture F16
Aperture ring Yes
Number of diaphragm blades 11
Aperture notes Rounded
Optics
Elements 17
Groups 15
Special elements / coatings Two Super-Low Dispersion elements, three aspherical elements, Super Multi-Layer coating, and water- and oil-resistant coating.
Focus
Minimum focus 0.23 m (9.06)
Autofocus Yes
Motor type Stepper motor
Full time manual Yes
Focus method Internal
Distance scale No
DoF scale No
Physical
Weight 635 g (1.40 lb)
Diameter 88 mm (3.46)
Length 111 mm (4.38)
Materials Aluminum, Thermally Stable Composite (TSC)
Sealing Yes
Colour Black
Filter thread 82 mm
Filter notes Rear filter holder + front thread
Hood supplied Yes
Hood product code LH898-04
Tripod collar No



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