Quick answer
The Sigma 20mm f/1.4 DG HSM Art is a ultra-wide prime lens covering 20mm at f/1.4 for the Pentax K mount. Its very wide maximum aperture suits low light and shallow depth of field with strong background blur.
About this lens
A 20mm f/1.4 full-frame fast wide-angle prime lens, the Sigma 20mm f/1.4 DG HSM Art is designed for Pentax K mount bodies, 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
- Pentax K
- 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?
At 20mm this is a ultra-wide prime, which typically suits:
- Landscapes and big skies
- Architecture and interiors
- Astrophotography and night skies
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
What mount does the Sigma 20mm f/1.4 DG HSM Art use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Sigma 20mm f/1.4 DG HSM Art?
It is a fixed 20mm lens with a maximum aperture of f/1.4. That makes it a ultra-wide lens.
Is the Sigma 20mm f/1.4 DG HSM Art a prime or a zoom lens?
It is a prime lens with a fixed 20mm focal length. Primes usually open wider than zooms; this one opens to f/1.4.
What is the Sigma 20mm f/1.4 DG HSM Art equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 30mm on full frame, with a 61.9° horizontal and 71.6° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Sigma 20mm f/1.4 DG HSM Art fit?
Any Pentax K-mount camera, including Pentax K-1, Pentax K-3, Pentax K-3 II, Pentax K-3 Mark III, and Pentax K-30 and 15 more.
Alternatives for Pentax K from other brands
All Pentax K lensesSame mount, overlapping focal range, closest maximum aperture first.
