Quick answer
The Pentax smc Pentax-A 120mm f/2.8 is a short telephoto prime lens covering 120mm 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-A 120mm f/2.8 is a short-telephoto prime lens covering 120mm at f/2.8 for Pentax K mount cameras. The focal length is a classic choice for portraits and details.
Pentax smc Pentax-A 120mm f/2.8 specifications
What can you shoot with the Pentax smc Pentax-A 120mm f/2.8?
At 120mm this is a short telephoto prime, which typically suits:
- Portraits with a flattering perspective
- Events and weddings
- Isolating subjects from the background
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 | 120mm | 17.1° | 20.4° |
| APS-C | 1.5x | 180mm | 11.4° | 13.7° |
Frequently asked questions
What mount does the Pentax smc Pentax-A 120mm f/2.8 use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Pentax smc Pentax-A 120mm f/2.8?
It is a fixed 120mm lens with a maximum aperture of f/2.8. That makes it a short telephoto lens.
Is the Pentax smc Pentax-A 120mm f/2.8 a prime or a zoom lens?
It is a prime lens with a fixed 120mm focal length. Primes usually open wider than zooms; this one opens to f/2.8.
What is the Pentax smc Pentax-A 120mm f/2.8 equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 180mm on full frame, with a 11.4° horizontal and 13.7° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Pentax smc Pentax-A 120mm f/2.8 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.
