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Camera Type
Mirrorless
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Corresponding Mount
L-Mount, Sony E-mount
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Sensor Format
Full-frame [DG]
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Lens Construction
17 elements in 15 groups
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Angle of View
94.5 °
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Number of Diaphragm Blades
11 (Rounded diaphragm)
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Minimum Aperture
F16
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Minimum Focusing Distance
23cm / 9.1in.
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Maximum Magnification Ratio
1:6.1
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Filter Size
φ82mm
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Dimensions (Diameter × Length)
L-Mount：φ87.8mm × 111.2mm / φ3.5in. × 4.4in.
Sony E-mount：φ87.8mm × 113.2mm / φ3.5in. × 4.5in.
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Weight
L-Mount：635g / 22.4oz.
Sony E-mount：630g / 22.2oz.
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Edition Number
A022
The three-digit code on the surface of the lens is to indicate the year the lens was first released.
(Since it is different from the year of manufacture, the release year and edition number may not match depending on the mount.) -
Supplied Accessories
・Case
・Petal-type LENS HOOD LH878-04
・FRONT CAP LCF-82 III
・REAR CAP LCR II
・GUIDE PLATE GP-21 -
Mount / Product Barcode
L-Mount：00-85126-41469-6
Sony E-mount：00-85126-41465-8
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Camera Compatibility
LINK
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* The appearance and specifications of the product are subject to change.
* This product is developed, manufactured and sold based on the specifications of E-mount which was disclosed by Sony Corporation under the license agreement with Sony Corporation.
* L-Mount is a registered trademark of Leica Camera AG.
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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
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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.
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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.
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.
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DG DN Art F1.4 series lineup
Lens construction
SLD glass
Aspherical lens
MTF Chart
The MTF (Modulation Transfer Function) is one of the measurements for evaluating a lens’ performance, and it shows how faithfully the contrast of the subject can be reproduced on the image plane. The horizontal axis shows the image height (distance from the center of the image in mm) and the vertical axis shows the contrast value (maximum value is 1).
The closer the 10 line pairs/mm curve is to 1, the higher the contrast and clarity of the lens is, and similarly, the closer the 30 line pairs/mm curve is to 1, the better the resolution and sharpness of the lens is.
*The MTF chart depicts the result at the wide-open aperture.
*For mirrorless lenses that support distortion correction, the horizontal axis shows the image height equivalent to when an L-Mount lens is attached to a Sigma L-Mount camera with distortion correction applied. (The effect of distortion correction may differ depending on the mount and camera used.)
*The spatial frequency indicates the variation on the image plane before distortion correction is performed.
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Spatial frequency
S:Sagittal Line
M:Meridional Line
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10lp/mm
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30lp/mm
Diffraction MTF
Geometrical MTF
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Lens construction: 17 elements in 15 groups
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Compatible with high-speed autofocus
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Compatible with front filter (φ82mm)
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Support for DMF and AF+MF
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Compatible with AF Assist (Sony E-mount only)
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AFL button
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Petal-type LENS HOOD (LH878-04)
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Compatible with Sigma USB DOCK UD-11 (sold separately; L-Mount only)
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Designed to minimize flare and ghosting
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Every single lens is evaluated with Sigma’s proprietary MTF measuring system
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11-blade rounded diaphragm
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High-precision, durable brass bayonet mount
| Camera | LEICA SL2 |
|---|---|
| Shutter Speed | 1/125s |
| Lens F Number | F1.4 |
| ISO | 1000 |
| Focal Length | 20mm |
| Photographer | Dean Sherwood |
| Camera | Sony α1 |
|---|---|
| Shutter Speed | 30s |
| Lens F Number | F1.4 |
| ISO | 1250 |
| Focal Length | （A soft filter is applied）20mm |
| Photographer | Numazawa Shigemi |
| Camera | Sony α1 |
|---|---|
| Shutter Speed | 30s |
| Lens F Number | F1.4 |
| ISO | 1000 |
| Focal Length | （A soft filter is applied）20mm |
| Photographer | Numazawa Shigemi |
| Camera | Sony α1 |
|---|---|
| Shutter Speed | 20s |
| Lens F Number | F1.4 |
| ISO | 3200 |
| Focal Length | （A soft filter is applied）20mm |
| Photographer | Numazawa Shigemi |
| Camera | Sony α1 |
|---|---|
| Shutter Speed | 1/400s |
| Lens F Number | F1.4 |
| ISO | 100 |
| Focal Length | 20mm |
| Photographer | Numazawa Shigemi |
| Camera | Sony α1 |
|---|---|
| Shutter Speed | 1/80s |
| Lens F Number | F2.5 |
| ISO | 1000 |
| Focal Length | 20mm |
| Photographer | Numazawa Shigemi |
| Camera | LEICA SL2-S |
|---|---|
| Shutter Speed | 1/16000s |
| Lens F Number | F2 |
| ISO | 100 |
| Focal Length | 20mm |
| Photographer | Tony Noël |
| Camera | LEICA SL2-S |
|---|---|
| Shutter Speed | 1/8000s |
| Lens F Number | F1.4 |
| ISO | 400 |
| Focal Length | 20mm |
| Photographer | Tony Noël |
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)
