Sigma Pentax K Wide Zoom

10-20mm f/4-5.6 EX DC HSM

10-20mm
f/4.0
Wide Zoom

Quick answer

The Sigma 10-20mm f/4-5.6 EX DC HSM is a ultra-wide wide zoom lens covering 10-20mm at f/4.0 for the Pentax K mount. Its moderate maximum aperture works best in good light or with a higher ISO.

About this lens

This 10-20mm f/4-5.6 APS-C wide-angle zoom lens from Sigma fits Pentax K mount cameras, with Hyper Sonic Motor autofocus. It covers wide angles for landscapes, interiors and architecture.

Sigma 10-20mm f/4-5.6 EX DC HSM specifications

Brand: Sigma
Mount: Pentax K
Focal length: 10-20mm
Maximum aperture: f/4.0
Lens type: Wide Zoom

What can you shoot with the Sigma 10-20mm f/4-5.6 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
Full frame	1.0x	10–20mm	84–121.9°	94.5–130.4°
APS-C	1.5x	15–30mm	61.9–100.4°	71.6–110.5°

Try the field-of-view calculator

Frequently asked questions

What mount does the Sigma 10-20mm f/4-5.6 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/4-5.6 EX DC HSM?

It zooms across 10-20mm with a maximum aperture of f/4.0. That makes it a ultra-wide lens.

Is the Sigma 10-20mm f/4-5.6 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/4.0.

What is the Sigma 10-20mm f/4-5.6 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.