Quick answer
The Rokinon 50mm f/1.4 AS UMC is a standard prime lens covering 50mm 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
The Rokinon 50mm f/1.4 AS UMC is a fast standard prime lens covering 50mm at f/1.4 for Pentax K mount cameras, with aspherical elements. The natural field of view suits street, documentary and everyday photography.
Rokinon 50mm f/1.4 AS UMC specifications
What can you shoot with the Rokinon 50mm f/1.4 AS UMC?
At 50mm 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 | 50mm | 39.6° | 46.8° |
| APS-C | 1.5x | 75mm | 27° | 32.2° |
Frequently asked questions
What mount does the Rokinon 50mm f/1.4 AS UMC use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Rokinon 50mm f/1.4 AS UMC?
It is a fixed 50mm lens with a maximum aperture of f/1.4. That makes it a standard lens.
Is the Rokinon 50mm f/1.4 AS UMC a prime or a zoom lens?
It is a prime lens with a fixed 50mm focal length. Primes usually open wider than zooms; this one opens to f/1.4.
What is the Rokinon 50mm f/1.4 AS UMC equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 75mm on full frame, with a 27° horizontal and 32.2° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Rokinon 50mm f/1.4 AS UMC 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.
