Quick answer
The Tokina AT-X 17-40mm f/3.5-4.5 is a ultra-wide to standard zoom lens covering 17-40mm 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
The Tokina AT-X 17-40mm f/3.5-4.5 is a wide-angle zoom lens covering 17-40mm at f/3.5-4.5 for Pentax K mount cameras. It covers wide angles for landscapes, interiors and architecture.
Tokina AT-X 17-40mm f/3.5-4.5 specifications
What can you shoot with the Tokina AT-X 17-40mm f/3.5-4.5?
At 17-40mm 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 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 | 17–40mm | 48.5–93.3° | 56.8–103.7° |
| APS-C | 1.5x | 26–60mm | 33.4–70.4° | 39.7–80.6° |
Frequently asked questions
What mount does the Tokina AT-X 17-40mm f/3.5-4.5 use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Tokina AT-X 17-40mm f/3.5-4.5?
It zooms across 17-40mm with a maximum aperture of f/3.5. That makes it a ultra-wide to standard lens.
Is the Tokina AT-X 17-40mm f/3.5-4.5 a prime or a zoom lens?
It is a zoom lens covering 17-40mm, so you can reframe without moving. Its maximum aperture is f/3.5.
What is the Tokina AT-X 17-40mm f/3.5-4.5 equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 26–60mm on full frame, with a 33.4–70.4° horizontal and 39.7–80.6° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Tokina AT-X 17-40mm f/3.5-4.5 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.
More Tokina lenses for Pentax K
All Tokina lenses
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