Photo: Henry Söderlund (CC BY 2.0)
Quick answer
The Sigma 40mm f/1.4 DG HSM Art is a standard prime lens covering 40mm 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
This 40mm f/1.4 full-frame fast standard prime lens from Sigma fits Pentax K mount cameras, from the Sigma Art line with Hyper Sonic Motor autofocus. The natural field of view suits street, documentary and everyday photography.
Sigma 40mm f/1.4 DG HSM Art specifications
- Brand
- Sigma
- Mount
- Pentax K
- Focal length
- 40mm
- Maximum aperture
- f/1.4
- Lens type
- Prime
- Format coverage
- full-frame
- Optical construction
- 16 elements in 12 groups
- Aperture blades
- 9
- Autofocus motor
- HSM
- Minimum focus distance
- 0.4 m
- Maximum magnification
- 0.15x
- Filter thread
- 82 mm
- Length
- 131 mm
- Diameter
- 87.8 mm
Specification source: sigmaphoto.com
What can you shoot with the Sigma 40mm f/1.4 DG HSM Art?
At 40mm this is a standard prime, which typically suits:
- Everyday and street photography
- Natural-perspective portraits
- Documentary and travel work
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 | 40mm | 48.5° | 56.8° |
| APS-C | 1.5x | 60mm | 33.4° | 39.7° |
Frequently asked questions
What mount does the Sigma 40mm 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 40mm f/1.4 DG HSM Art?
It is a fixed 40mm lens with a maximum aperture of f/1.4. That makes it a standard lens.
Is the Sigma 40mm f/1.4 DG HSM Art a prime or a zoom lens?
It is a prime lens with a fixed 40mm focal length. Primes usually open wider than zooms; this one opens to f/1.4.
What is the Sigma 40mm f/1.4 DG HSM Art equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 60mm on full frame, with a 33.4° horizontal and 39.7° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Sigma 40mm 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.
