Quick answer
A fast ultra-wide prime for full-frame DSLRs and a favourite for astrophotography. It weighs about 950 g and has a bulbous front element that cannot take screw-in filters.
Pros
- f/1.4 aperture at 20mm
- Close focus of 0.276 m
- HSM autofocus
- Wide field with low light capability
Cons
- Heavy at about 950 g
- No screw-in front filters
- Corners soften at f/1.4
Verdict
A specialist wide lens for dark-sky work. It is big, but few alternatives are as fast.
About this lens
This 20mm f/1.4 full-frame fast wide-angle prime lens from Sigma fits Nikon F mount cameras, from the Sigma Art line with Hyper Sonic Motor autofocus. A wide-aperture wide-angle prime from Sigma's Art line, popular for astrophotography and landscapes.
Sigma 20mm f/1.4 DG HSM Art specifications
- Brand
- Sigma
- Mount
- Nikon F
- Focal length
- 20mm
- Maximum aperture
- f/1.4
- Lens type
- Prime
- Format coverage
- full-frame
- Optical construction
- 15 elements in 11 groups
- Aperture blades
- 9
- Autofocus motor
- HSM
- Minimum focus distance
- 0.28 m
- Maximum magnification
- 0.14x
- Weight
- 950 g
- Length
- 129.8 mm
- Diameter
- 90.7 mm
Specification source: sigmaphoto.com
What can you shoot with the Sigma 20mm f/1.4 DG HSM Art?
- Astrophotography
- Landscapes in low light
- Interiors and architecture
Its very wide maximum aperture suits low light and shallow depth of field with strong background blur.
Full-frame equivalent and field of view
Calculated from the focal length and crop factor. Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| Full frame | 1.0x | 20mm | 84° | 94.5° |
| APS-C | 1.5x | 30mm | 61.9° | 71.6° |
Frequently asked questions
Is the Sigma 20mm f/1.4 Art good for astrophotography?
Yes. The f/1.4 aperture gathers a lot of light and 20mm covers a large part of the sky, although stars at the edges show some aberrations wide open.
Can screw-in filters be used on the Sigma 20mm f/1.4 Art?
No. The bulbous front element has no filter thread, so screw-in filters are not an option.
How heavy is the Sigma 20mm f/1.4 Art?
About 950 g, which makes it a substantial lens for a 20mm prime.
Alternatives for Nikon F from other brands
All Nikon F lensesSame mount, overlapping focal range, closest maximum aperture first.
