20mm F1.4
DG DN | A
- All-metal construction
- Manual aperture ring
- Arc-style focus mode switch
- High-speed, accurate autofocus
- Magnetic lens cap and metal lens hood
- Mount with dust and splash-resistant structure
- Designed to minimize flare and ghosting
- Compatible with Lens Aberration Correction*
- Made in Japan
| Angle of view | Wide Angle |
|---|---|
| Camera Type | Mirrorless |
| Lens Mount | L-Mount, Sony E-mount |
| Sensor Size | Full Frame |
| Construction | 17 elements in 15 groups |
| Angle of view | 94.5 ° (FF), 70.7 ° (APS-C) |
| Number of diaphragm blades | 11 (rounded diaphragm) |
| Minimum aperture | F16 |
| Minimum focusing distance | 23 cm |
| Maximum magnification ratio | 1:6.1 |
| Filter diameter | φ 82mm |
| Dimensions (diameter x length) | L-mount ⌀ 87,8 mm x 111,2 mm |
| Weight (g) | 635 g |
| Edition number | A022 |
| Supplied Accessories | Case, Petal-type hood with lock (LH878-04), Front Cap (LCF-82 III), Rear Cap (LCR II), Guide Plate (GP-21) |
| Accessories | SIGMA USB Dock UD-11 (L-Mount), SIGMA WR CERAMIC PROTECTOR 82mm, SIGMA WR PROTECTOR 82mm, SIGMA PROTECTOR 82mm, SIGMA WR UV FILTER 82mm, SIGMA WR CIRCULAR PL FILTER 82mm |
| EAN-code | L-mount 085126414696 |
| Specifications Info | * All figures calculated by L-Mount. Note: The L-Mount Trademark is a registered Trademark of Leica Camera AG. About Product Name: Product name includes "DG" when the lens is designed to deliver the ultimate in performance on cameras with full-frame sensors, and "DN" when the lens design is optimized for mirrorless cameras with the short flange focal length. |
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.
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.
ART
20mm F1.4 DG DN
ART
24mm F1.4 DG DN
LENS CONSTRUCTION
|
|
|
FLD GLASS
SLD GLASS
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.
|
Spatial frequency |
S:Sagittal Line |
M: Meridional Line |
|
10lp/mm |
|
|
|
30lp/mm |
|
|
DIFFRACTION MTF
DIFFRACTION MTF
GEOMETRICAL MTF
GEOMETRICAL MTF
Inner focus system
To increase stability, this lens configuration uses movable internal lens elements that adjust focus without changing the length of the lens barrel.
Stepping Motor
The lens is capable of smooth, quiet and high-speed AF made possible by a stepping motor, as well as supports Face/Eye Detection AF and video AF.
Compatible with Lens Aberration Correction
Matching the optical characteristics of the lens, this function performs in-camera corrections of peripheral illumination, chromatic aberrations, distortion, and more, to further enhance image quality.
*Function available on supported cameras only. Available corrections or auto correction functionality may vary depending on the camera model.
*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).
Super Multi-Layer Coating
SIGMA's own Super Multi-Layer Coating suppresses flare and ghosting by preventing reflections with in the lens. All lenses in the current SIGMA range feature this original technology. In digital cameras, flare and ghosting may also be caused by reflections between the image sensor and lens surfaces. Here too, SIGMA's Super Multi-Layer Coating is highly ef fective, assuring images of outstanding contrast.
Water and oil repellent coating
Incorporates a water and oil-repellent coating that allows water to be wiped away easily and prevents oil and fat from sticking to the surface, even in challenging shooting conditions. At the same time, the maintenance of the lens surface becomes easier.
Aperture ring
Aperture ring, designed to help users work intuitively
Aperture ring click switch
Mounted with a de-click function for removing clicks by the aperture ring click switch, enabling seamless operations that are especially useful such as during video shooting.
Aperture ring lock switch
A ring lock system to prevent from unintended movement of the aperture ring during shooting.
MFL switch
The MFL (Manual Focus Lock) switch disengages the focus ring on the lens. After manually focusing the lens to the desired position, set the MFL switch to 'LOCK' in order ]to disengage the focus ring.
This prevents the focus of the lens from being moved by accident (such as when attaching a lens heater or changing the composition) and causing out of focus images. The focus ring can still be rotated but will have no effect.
* Please note that some camera bodies may continue to AF even if the MFL switch is set to 'LOCK', or allow AF temporarily even when the camera has been set to MF, and shift the focus when the MFL switch is set to 'LOCK'.
Rear filter holder
The rear filter holder allows the attachment of a sheet-type filter to the rear part of the lens.
Trace the shape on a sheet filter using the guide plate and cut it out for use.
Lens Heater Retainer
The Lens Heater Retainer is a protruding lip at the front of the lens. When the lens is used in conjunction with a lens heater, the Lens Heater Retainer stops the heater from over hanging the front element and causing vignetting. Lens heaters prevent condensation and night dew during nightscape photography such as astrophotography.
Focus Mode Switch
Using this swich, it is possible to switch the focus mode between AF and MF.
Dust and Splash Resistant Structure
This lens features a highly effective dust and splash resistant structure with special sealing at the mount connection, manual focus ring, zoom ring, and cover connection.
*Although this construction allows the lens to be used in light rain, it is not the same as being waterproof, so please prevent large amounts of water from splashing on the lens. It is often impractical to repair the internal mechanism, lens elements and electric components if they are damaged by water.
Linear focus / Non-linear focus (for L-Mount only）
A focus movement method of interchangeable lenses for mirrorless cameras (DN lens) in relation to the rotational angle of the focus ring during manual focusing.
With "non-linear focus," the amount of focal point movement varies depending on the focus ring rotational speed.
With linear focus, if the focus ring rotational angle is the same, the amount of focal point movement remains the same regardless of the focus ring rotational speed.
Lens construction: 17 elements in 15 groups
Compatible with high-speed autofocus
Compatible with front filter (φ82mm)
Support for DMF and AF+MF
Compatible with AF Assist (Sony E-mount only)
AFL button
Petal-type LENS HOOD (LH878-04)
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
