Sigma Pentax K Zoom

17-50mm f/2.8 EX DC HSM

17-50mm
f/2.8
Zoom
Min focus 0.28 m

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Quick answer

The Sigma 17-50mm f/2.8 EX DC HSM is a ultra-wide to standard zoom lens covering 17-50mm at f/2.8 for the Pentax K mount. Its bright maximum aperture handles indoor and evening light reasonably well.

About this lens

Sigma 17-50mm f/2.8 EX DC HSM: an APS-C fast standard zoom lens with a 17-50mm focal length and a maximum aperture of f/2.8, made for Pentax K mount cameras, with Hyper Sonic Motor autofocus. A bright standard zoom for APS-C cameras with a constant f/2.8 aperture.

Sigma 17-50mm f/2.8 EX DC HSM specifications

Brand: Sigma
Mount: Pentax K
Focal length: 17-50mm
Maximum aperture: f/2.8
Lens type: Zoom
Optical construction: 17 elements in 13 groups
Aperture blades: 7
Minimum focus distance: 0.28 m
Maximum magnification: 0.2x
Filter thread: 77 mm

Specification source: dyxum.com

What can you shoot with the Sigma 17-50mm f/2.8 EX DC HSM?

At 17-50mm this is a ultra-wide to standard zoom, which typically suits:

Landscapes and big skies
Architecture and interiors
Astrophotography and night skies
Landscapes and cityscapes
Street and travel photography

Its bright maximum aperture handles indoor and evening light reasonably well.

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	17–50mm	39.6–93.3°	46.8–103.7°
APS-C	1.5x	26–75mm	27–70.4°	32.2–80.6°

Try the field-of-view calculator

Frequently asked questions

What mount does the Sigma 17-50mm f/2.8 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 17-50mm f/2.8 EX DC HSM?

It zooms across 17-50mm with a maximum aperture of f/2.8. That makes it a ultra-wide to standard lens.

Is the Sigma 17-50mm f/2.8 EX DC HSM a prime or a zoom lens?

It is a zoom lens covering 17-50mm, so you can reframe without moving. Its maximum aperture is f/2.8.

What is the Sigma 17-50mm f/2.8 EX DC HSM equivalent on a crop sensor?

On APS-C (1.5x crop) it frames like 26–75mm on full frame, with a 27–70.4° horizontal and 32.2–80.6° diagonal field of view. These figures are calculated from the focal length and crop factor.