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Sigma 20mm F1.4 DG HSM Art Lens for DSLR Cameras, SIGMA SA-Mount, High-Speed Lens for snapshots
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SKU
SIG412956
$989.00
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Key Features
- Large-Diameter Aspherical Element: Enables ultra-wide 20 mm, bright f/1.4 performance with significantly reduced distortion.
- FLD and SLD Low-Dispersion Glass: Minimizes chromatic aberration and color fringing for consistently clean detail across the frame.
- 15-Element Optical Design in 11 Groups: Optimized for maximum sharpness, high contrast, and precise control of aberrations.
- 9-Blade Rounded Diaphragm: Produces smooth, pleasing out-of-focus highlights for refined background separation.
- Hyper Sonic Motor (HSM) Autofocus: Fast and quiet AF performance with full-time manual override for precision control.
- Durable Mount and Build Structure: Brass bayonet and TSC materials ensure long-term reliability and stable optical alignment.
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Sigma 20mm F1.4 DG HSM Art Lens for DSLR Cameras, SIGMA SA-Mount, High-Speed Lens for snapshots Overview
Description
The SIGMA 20mm F1.4 DG HSM | Art, SA-mount is an ultra-wide, fast-aperture prime engineered for full-frame DSLR shooters who demand corner-to-corner sharpness and superior low-light performance. Its 15-element, 11-group optical formula, including FLD and SLD elements and a large aspherical element, controls distortion and chromatic aberration while delivering a bright f/1.4 aperture for night and low-light work.
Robust materials including a brass bayonet and Thermally Stable Composite, combined with a Hypersonic Motor AF system and full-time manual override, ensure reliable handling and precise focusing for landscapes, architecture, and astrophotography.
The SIGMA 20mm F1.4 DG HSM | Art brings pro-grade ultra-wide performance to SA-mount full-frame systems, offering a 94.5° diagonal field of view and a very bright f/1.4 aperture that excels for low-light, night sky, landscape, and interior photography, while maintaining excellent resolution across the frame.
Problem
Many wide-angle lenses struggle with corner softness, chromatic aberration, coma in night images, and insufficient light gathering at wide apertures—issues that limit astrophotography and low-light landscape work.
- Corner softness at wide apertures.
- Chromatic aberration and coma in night sky images.
- Insufficient low-light capability without high ISO.
These images and the supporting notes highlight the lens' two primary strengths: optical performance across a very wide field of view, and mechanical reliability for field use. Optically, the lens' 15-element, 11-group construction places FLD and SLD elements where they most effectively reduce lateral and longitudinal chromatic aberration, so high-contrast details maintain colour fidelity from centre to corner. The large-diameter aspherical front element suppresses spherical aberration and helps the optical formula keep coma down, which is critical when rendering pinpoint stars at wide apertures and long exposures.
Mechanically, the images show a robust bayonet and precision-machined surfaces. Thermally Stable Composite components help maintain focus and optical alignment across temperature swings encountered during dawn/dusk shoots or cold-night astrophotography. The Hypersonic Motor offers a balance of speed and silence—useful for both stills and quiet-location work—and full-time manual override allows immediate correction without switching focus modes.
Practically, photographers will notice three outcomes: cleaner low-light images because f/1.4 allows lower ISO and shorter exposures; improved corner sharpness that expands usable framing options for landscape and architectural work; and faithful star rendering with reduced coma for astrophotography. The rounded 9-blade diaphragm contributes to pleasing bokeh where foreground subjects are separated against wide scenes, while the internal focusing and short minimum focus distance of 27.6 cm expand creative close-environment shots without changing the lens profile.
In sum, the visuals communicate how the SIGMA 20mm F1.4 DG HSM | Art translates technical design into field performance: a wide, bright perspective that remains resolute in difficult lighting, and a construction that supports repeatable accuracy for professional shooters.
Solution
The lens solves corner softening, aberration, and low-light limitations using its advanced optical formula—aspherical, FLD, and SLD elements—paired with precision manufacturing and an HSM focusing system, delivering usable, high-quality images even at f/1.4.
Benefits
- Low-light mastery: f/1.4 aperture gathers more light, enabling lower ISO and cleaner images.
- Corner-to-corner sharpness: Optical design yields high resolution across the frame.
- Astrophotography-ready: Reduced coma and low-dispersion glass preserve star points.
- Reliable handling: Metal bayonet and TSC materials resist wear and temperature changes.
Applications
- Astrophotography, Milky Way and night-sky imaging
- Landscape and wide environmental portraiture
- Architectural interiors and real-estate photography
Why Choose
- Among the first 20mm f/1.4 full-frame primes, this Art-series optical formula offers OEM-challenging sharpness and minimal aberration.
Specifications
| Model Name / Number | 20mm F1.4 DG HSM | Art, SA-mount |
| Lens Type | Prime |
| Intended Use | Photography, Video |
| Color / Finish | Black |
| Weather Sealing | Not specified |
| Dimensions (Diameter Length) | f90.7 mm 129.8 mm |
| Weight | 950 g |
| Mount Type | SIGMA SA-mount |
| Compatible Sensor Size | Full-Frame (DG), also supports APS-C |
| Supported Camera Brands / Systems | SIGMA SA-mount DSLR bodies |
| Coverage | 35mm |
| Focal Length (Fixed / Zoom Range) | 20 mm |
| Maximum Aperture | f/1.4 |
| Minimum Aperture | f/16 |
| Aperture Type (Circular, Number of Blades) | Circular, 9 blades |
| Optical Construction (Elements / Groups) | 15 elements in 11 groups |
| Special Elements (Aspherical, ED, Fluorite, etc.) | 2 FLD, 5 SLD, aspherical elements |
| Coatings (Nano Coating, Multi-Coating, Fluorine Coating) | Multi-coating |
| Focus Type (Autofocus, Manual Focus) | Autofocus with full-time manual override |
| Autofocus Motor Type (Stepper, Ring-USM, Linear, Screw Drive) | Hypersonic Motor (HSM), ring-type ultrasonic |
| Focus Modes (AF-S, AF-C, MF) | AF with full-time MF override |
| Minimum Focus Distance | 27.6 cm |
| Maximum Magnification Ratio (e.g., 1:1 for Macro) | 0.14 (1:7.1) |
| Internal Focusing | Yes |
| Full-Time Manual Override | Yes |
| Filter Thread Size (mm) | Not specified |
| Front Element Rotation | No |
| Compatible Lens Hood Model | LC907-01 (front cap model noted) |
| Close Focusing Distance | 27.6 cm |
| Angle of View (diagonal) | 94.5 |
| Brand | SIGMA |
| Manufacturer SKU | 412956 |
| UPC | 0085126412562 |
What’s included
- 1- 20mm F1.4 DG HSM Art Lens, SIGMA SA-Mount
- 1- LCR II Rear Lens Cap
- 1- LC907-01 Cover Lens Cap
Compatibility
| FREEFLY Ember S5K | Sony BURANO | Sony ILX-LR1 | Sony NEX-VG30 | Sony PXW-FS7M2 |
| Kinefinity MAVO LF MKII | Sony BURANO CineAlta Digital Cinema Camera | Sony NEX-EA50M | Sony NEX-VG900 | Sony PXW-FX9 |
| Kinefinity MAVO S35 MKII | Sony FX3 | Sony NEX-EA50UH | Sony PXW-FS5 | Sony VENICE 6K Digital Motion Picture Camera |
| Sony FX30 | Sony FX6 | Sony NEX-FS700R | Sony NEX-FS700U | Sony PXW-FS5M2 |
| Sony PXW-FS7 |
FAQ
Is the SIGMA 20mm F1.4 good for astrophotography?
Yes. The lens combines a very wide f/1.4 aperture with specialised FLD and SLD elements and optimized optics to reduce coma and preserve star points, making it well suited for Milky Way and night-sky work.
How sharp is the SIGMA 20mm at f/1.4?
Very sharp. The 15-element, 11-group optical design and aspherical element deliver high resolution across the frame, with excellent center and improved corner performance even wide open.
Does this SA-mount lens work on APS-C bodies?
Yes. The lens is optimised for full-frame (DG), but it is compatible with APS-C sensors where it yields an equivalent field of view around 30 mm.
What is the closest focusing distance?
The minimum focusing distance is 27.6 cm (10.9 in), with a maximum magnification ratio of approximately 0.14 (1:7.1).
Does the lens have a filter thread?
Sigma does not specify a conventional front filter thread for this design; if filters are required, consult manufacturer notes for compatible rear or gelatin solutions.
What autofocus motor does the lens use?
It uses a Hypersonic Motor, HSM, a ring-type ultrasonic drive providing fast, quiet autofocus and full-time manual-focus override.
How heavy is the SA-mount version?
The SA-mount version weighs approximately 950 g, reflecting its large glass elements and robust build.
Is this lens weather sealed?
Sigma specifies a robust brass bayonet mount and Thermally Stable Composite materials for durability; specific weather sealing ratings are not listed here, so treat as durable but verify for extreme conditions.
What accessories are included in the box?
The supplied items listed are: case, front lens cap LC907-01, and rear cap LCR II. Confirm final box contents with your seller.
Is the SA-mount variant still produced?
Some mount variants for this model have been listed as discontinued by the manufacturer; availability can vary, and SA-mount listings may be limited or offered as used/refurbished stock.
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