Quick answer
The Pentax smc Pentax-DA* 55mm f/1.4 SDM is a standard prime lens covering 55mm at f/1.4 for the Pentax K mount. Its very wide maximum aperture suits low light and shallow depth of field with strong background blur.
About this lens
This 55mm f/1.4 fast standard prime lens from Pentax fits Pentax K mount cameras. A premium weather-resistant "Star" series lens for Pentax K-mount cameras.
Pentax smc Pentax-DA* 55mm f/1.4 SDM specifications
What can you shoot with the Pentax smc Pentax-DA* 55mm f/1.4 SDM?
At 55mm this is a standard prime, which typically suits:
- Everyday and street photography
- Natural-perspective portraits
- Documentary and travel work
Its very wide maximum aperture suits low light and shallow depth of field with strong background blur.
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 | 55mm | 36.2° | 42.9° |
| APS-C | 1.5x | 83mm | 24.6° | 29.4° |
Frequently asked questions
What mount does the Pentax smc Pentax-DA* 55mm f/1.4 SDM 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* 55mm f/1.4 SDM?
It is a fixed 55mm lens with a maximum aperture of f/1.4. That makes it a standard lens.
Is the Pentax smc Pentax-DA* 55mm f/1.4 SDM a prime or a zoom lens?
It is a prime lens with a fixed 55mm focal length. Primes usually open wider than zooms; this one opens to f/1.4.
What is the Pentax smc Pentax-DA* 55mm f/1.4 SDM equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 83mm on full frame, with a 24.6° horizontal and 29.4° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Pentax smc Pentax-DA* 55mm f/1.4 SDM 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.
