An Art level 20mm F1.4.
The ultimate lens for astrophotography.
Outstanding optical quality and a range of invaluable features –
The ultimate astrophotography lens from the 20mm F1.4 pioneer
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 photographers 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)
Impression
©Jack Fusco
©Tony Noël
©Dean Sherwood
©Shigemi Numazawa
Features
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.
The largest class double-sided aspherical glass element
Designed for perfect results even in the most demanding conditions
The new MFL (Manual Focus Lock) switch
When the MFL switch is set to “LOCK”, the focus ring operation will be disabled.
This is to prevent the focus ring from accidentally being moved, which would cause out-of-focus images.
Support front and rear filters
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, sharp photographs of nightly landscapes with star-filled skies.
Lens heater retainer
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.
Superb build quality and usability with uncompromising attention to detail
Its dust- and splash-resistant structure* 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.
* Although this construction allows the lens to be used in light rain, it is not the same as being waterproof.
1 Focus mode switch
2 AFL button
3 MFL (Manual Focus Lock) switch
4 Aperture ring click switch
5 Lock mechanism
6 Aperture ring lock switch
Thoughtful features such as a focus mode switch, a customizable AFL* 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.
* Only on compatible cameras. Available functions may vary depending on the camera used.
DG DN Art F1.4 series lineup
Additional features
Lens construction: 17 elements in 15 groups
Compatible with high-speed autofocus
Compatible with front filter (φ82mm)
Compatible with Lens Aberration Correction
*On cameras where lens aberration correction is controlled with ‘ON’ or ‘OFF’ in the camera menu, please set all aberration correction functions to ‘ON'(AUTO).
Support for DMF and AF+MF
Compatible with AF Assist (Sony E-mount only)
Water- and oil-repellent coating
AFL button
Support for switching between linear and non-linear focus ring settings (L-Mount only)
Petal-type LENS HOOD (LH878-04)
Dust and Splash Resistant Structure
Compatible with SIGMA USB DOCK UD-11 (sold separately; L-Mount only)
Designed to minimize flare and ghosting
Every single lens is evaluated with SIGMA’s proprietary MTF measuring system
11-blade rounded diaphragm
High-precision, durable brass bayonet mount
ESSENTIALS
You'll find our philosophy and craftsmanship
in every product
Our new lineup fully expresses our approach to lenses and photography itself. All of our lenses belong to one of three lines—Art, Contemporary, or Sports—all of which share our development philosophy and advanced manufacturing system. High performance, high quality, and high end in every respect, these lenses give people who love photography lasting value and consistent, exciting results. The secret is our passion for craftsmanship that we put into every production process and every product.
Specifications
20mm F1.4 DG DN | Art
Lens Construction
- SLD glass
- ASPHERICAL LENS
Lens Construction
Angle of View
- 94.5 °
Number of Diaphragm Blades
Minimum Aperture
Minimum Focusing Distance
Maximum Magnification Ratio
Filter size
Dimensions (Diameter × Length)
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L-Mount
φ87.8mm × 111.2mm / φ3.5in. × 4.4in. -
Sony E-Mount
φ87.8mm × 113.2mm / φ3.5in. × 4.5in.
Weight
-
L-Mount
635g / 22.4oz. -
Sony E-Mount
630g / 22.2oz.
Edition Number
Supplied Accessories
・Case
・Petal-type LENS HOOD LH878-04
・FRONT CAP LCF-82 III
・REAR CAP LCR II
・GUIDE PLATE GP-21
Performance / Data
MTF Chart
Diffraction MTF
Geometrical MTF
Product Lineup
20mm F1.4 DG DN | Art
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L-Mount
- Supplied Accessories
・Case
・Petal-type LENS HOOD LH878-04
・FRONT CAP LCF-82 III
・REAR CAP LCR II
・GUIDE PLATE GP-21
-
Sony E-mount
- Supplied Accessories
・Case
・Petal-type LENS HOOD LH878-04
・FRONT CAP LCF-82 III
・REAR CAP LCR II
・GUIDE PLATE GP-21
Support
20mm F1.4 DG DN | Art
FAQ
Accessories
Supplied Accessories
FRONT CAP LCF-82mm Ⅲ
REAR CAP LCR Ⅱ
* The image is for SIGMA.
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L-Mount
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Sony E-mount
LENS HOOD LH878-04
Separately Sold Accessories
USB DOCK UD-11
Designed exclusively for the use with a SIGMA Contemporary, Art, or Sports lens and its accessories, the SIGMA USB DOCK allows users to update firmware and adjust the sensitivity of speed to the MF function* through the UD-11.
* Scope of adjustment varies depending on specifications of the individual product.
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L-Mount
WR PROTECTOR 82mm
Water-repellent, Antistatic type. Protector is developed to protect the lens surface from dirt and dust as well as scratches. It is an ideal filter for regular use as it is completely colorless so does not affect color reproduction.
* Thinner frame wide type.
PROTECTOR 82mm
Normal type. Protector is developed to protect the lens surface from dirt and dust as well as scratches. It is an ideal filter for regular use as it is completely colorless so does not affect color reproduction.
* Thinner frame wide type.
WR UV FILTER 82mm
UV Water-repellent, Antistatic type. UV filter prevents the bluish tone that generates when the weather is fine, by absorbing ultraviolet rays. It is effective in most situations, such as landscape, portrait and general photography on a sunny day. It is also an ideal filter for regular use as it is completely colorless so does not affect color reproduction.
* Thinner frame wide type.
WR CIRCULAR PL FILTER 82mm
PL Water-repellent, Antistatic type. Circular PL filter removes the reflection of water surface and glass windows, and increases the contrast in landscape photography.
* Thinner frame wide type.
Catalogs / Resources
Manuals / Brochures
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SIGMA Lens Catalogue 2022 Autumn (Brochures)
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20mm F1.4 DG DN | Art (Brochures)
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20mm F1.4 DG DN | Art (Manuals)
Impressions / Samples
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Passion: Broadening the mind for a bigger world | Tony Noël
Tony Noel is an action photographer based in France. Through his photos, he shows his passion for the dynamic movement of his models who are mostly dancers, and tries to push his boundary with a wide-angle lens. He enjoyed the look that a 20mm lens brings to create variations of similar scenes. We can see that he plays with the tension that is given by the wide angle as well as the close-up like effect to create a sort of rhythm in similar scenes.
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My dream lens for astrophotography | Jack Fusco
These beautiful photos were taken in Assateague National Seashore in Maryland and Taughannock Falls near Ithaca, New York for the starry sky, waterfall and Milky way. The wide angle of view of 20mm conveys the grandeur of nature. Jack was blown away by the optical performance of this lens, even in the extreme corners. The stars remained pinpoint dots of light, truly an astrophotographer’s dream.
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The 20mm born for people who are active in backstages | Dean Sherwood
Dean Sherwood is a photographer and cinematographer based in London who usually works with musicians. 20mm is a fun focal length for him. Most people may assume it’s a landscape lens but it is perfect to use in small spaces like backstage in dressing rooms, in a studio, stuck between a drummer and a stage backdrop. He also commented that it beautifully balanced on his Leica SL2. It’s light, but not toy-like in its feel, it feels robust, it feels like a lens he would be able to trust.
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Capturing the night sky in depths beyond human reach | Numazawa Shigemi
Numazawa Shigemi is a Japanese astronomical photographer. He commented that, surprisingly, the SIGMA 20mm F1.4 DG DN | Art suppresses sagittal coma flare to near perfection from the maximum aperture. The contrast, vignetting, and performance against backlight at F1.4 are also perfect, and it is wonderful to be able to enjoy its open aperture performance without worry.
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20mm F1.4 DG DN | Art Sample photo gallery
