Photo: Jun Ohwada (CC BY 2.0)
smc Pentax-DA 40mm f/2.8 XS
- 40mm
- f/2.8
- Prime
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Quick answer
The Pentax smc Pentax-DA 40mm f/2.8 XS is a standard prime lens covering 40mm at f/2.8 for the Pentax K mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
The Pentax smc Pentax-DA 40mm f/2.8 XS is a standard prime lens covering 40mm at f/2.8 for Pentax K mount cameras. The natural field of view suits street, documentary and everyday photography.
Pentax smc Pentax-DA 40mm f/2.8 XS specifications
What can you shoot with the Pentax smc Pentax-DA 40mm f/2.8 XS?
At 40mm this is a standard prime, which typically suits:
- Everyday and street photography
- Natural-perspective portraits
- Documentary and travel work
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 | 40mm | 48.5° | 56.8° |
| APS-C | 1.5x | 60mm | 33.4° | 39.7° |
Frequently asked questions
What mount does the Pentax smc Pentax-DA 40mm f/2.8 XS use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Pentax smc Pentax-DA 40mm f/2.8 XS?
It is a fixed 40mm lens with a maximum aperture of f/2.8. That makes it a standard lens.
Is the Pentax smc Pentax-DA 40mm f/2.8 XS 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/2.8.
What is the Pentax smc Pentax-DA 40mm f/2.8 XS 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 Pentax smc Pentax-DA 40mm f/2.8 XS 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.
