Quick answer
The Rokinon 12mm f/2.8 ED AS NCS Fisheye is a ultra-wide fisheye lens covering 12mm at f/2.8 for the Pentax K mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
The Rokinon 12mm f/2.8 ED AS NCS Fisheye is a fisheye lens covering 12mm at f/2.8 for Pentax K mount cameras, with extra-low dispersion glass and aspherical elements. It suits dramatic perspectives, astrophotography and creative wide-field work.
Rokinon 12mm f/2.8 ED AS NCS Fisheye specifications
What can you shoot with the Rokinon 12mm f/2.8 ED AS NCS Fisheye?
At 12mm this is a ultra-wide fisheye, which typically suits:
- Landscapes and big skies
- Architecture and interiors
- Astrophotography and night skies
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 | 12mm | 112.6° | 122° |
| APS-C | 1.5x | 18mm | 90° | 100.5° |
Frequently asked questions
What mount does the Rokinon 12mm f/2.8 ED AS NCS Fisheye use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Rokinon 12mm f/2.8 ED AS NCS Fisheye?
It is a fixed 12mm lens with a maximum aperture of f/2.8. That makes it a ultra-wide lens.
Is the Rokinon 12mm f/2.8 ED AS NCS Fisheye a prime or a zoom lens?
It is a prime lens with a fixed 12mm focal length. Primes usually open wider than zooms; this one opens to f/2.8.
What is the Rokinon 12mm f/2.8 ED AS NCS Fisheye equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 18mm on full frame, with a 90° horizontal and 100.5° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Rokinon 12mm f/2.8 ED AS NCS Fisheye 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.
