Photo: Jacek Halicki (CC BY-SA 4.0)
Quick answer
The Sigma 10-20mm f/3.5 EX DC HSM is a ultra-wide wide zoom lens covering 10-20mm at f/3.5 for the Pentax K mount. Its moderate maximum aperture works best in good light or with a higher ISO.
About this lens
A 10-20mm f/3.5 APS-C wide-angle zoom lens, the Sigma 10-20mm f/3.5 EX DC HSM is designed for Pentax K mount bodies, with Hyper Sonic Motor autofocus. It covers wide angles for landscapes, interiors and architecture.
Sigma 10-20mm f/3.5 EX DC HSM specifications
- Brand
- Sigma
- Mount
- Pentax K
- Focal length
- 10-20mm
- Maximum aperture
- f/3.5
- Lens type
- Wide Zoom
- Format coverage
- aps-c
- Optical construction
- 13 elements in 10 groups
- Aperture blades
- 7
- Autofocus motor
- HSM
- Minimum focus distance
- 0.24 m
- Maximum magnification
- 0.15x
- Filter thread
- 82 mm
- Weight
- 520 g
- Length
- 88.2 mm
- Diameter
- 87.3 mm
Specification source: sigmaphoto.com
What can you shoot with the Sigma 10-20mm f/3.5 EX DC HSM?
At 10-20mm this is a ultra-wide wide zoom, which typically suits:
- Landscapes and big skies
- Architecture and interiors
- Astrophotography and night skies
Its moderate maximum aperture works best in good light or with a higher ISO.
Full-frame equivalent and field of view
Calculated from the focal length and crop factor. Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| APS-C | 1.5x | 15–30mm | 61.9–100.4° | 71.6–110.5° |
Frequently asked questions
What mount does the Sigma 10-20mm f/3.5 EX DC HSM use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Sigma 10-20mm f/3.5 EX DC HSM?
It zooms across 10-20mm with a maximum aperture of f/3.5. That makes it a ultra-wide lens.
Is the Sigma 10-20mm f/3.5 EX DC HSM a prime or a zoom lens?
It is a zoom lens covering 10-20mm, so you can reframe without moving. Its maximum aperture is f/3.5.
What is the Sigma 10-20mm f/3.5 EX DC HSM equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 15–30mm on full frame, with a 61.9–100.4° horizontal and 71.6–110.5° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Sigma 10-20mm f/3.5 EX DC HSM 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.
Pentax
HD Pentax-DA 10-17mm F3.5-4.5 ED fisheye
10-17mm · f/3.5 · Pentax K
Pentax
smc DA 10-17mm F3.5-4.5 ED (IF) Fisheye
10-17mm · f/3.5 · Pentax K
Tamron
SP AF 10-24mm F/3.5-4.5 Di II LD Aspherical (IF)
10-24mm · f/3.5 · Pentax K
Pentax
smc Pentax-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF
10-17mm · f/3.5 · Pentax K
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