Quick answer
The Sigma 17mm f/2.8 Fisheye is a ultra-wide fisheye lens covering 17mm at f/2.8 for the Sigma SA mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
The Sigma 17mm f/2.8 Fisheye is a fisheye lens covering 17mm at f/2.8 for Sigma SA mount cameras. It suits dramatic perspectives, astrophotography and creative wide-field work.
Sigma 17mm f/2.8 Fisheye specifications
What can you shoot with the Sigma 17mm f/2.8 Fisheye?
At 17mm 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 | 17mm | 93.3° | 103.7° |
| APS-C | 1.5x | 26mm | 70.4° | 80.6° |
Frequently asked questions
What mount does the Sigma 17mm f/2.8 Fisheye use?
It uses the Sigma SA mount, so it fits Sigma SA cameras directly.
What is the focal length of the Sigma 17mm f/2.8 Fisheye?
It is a fixed 17mm lens with a maximum aperture of f/2.8. That makes it a ultra-wide lens.
Is the Sigma 17mm f/2.8 Fisheye a prime or a zoom lens?
It is a prime lens with a fixed 17mm focal length. Primes usually open wider than zooms; this one opens to f/2.8.
What is the Sigma 17mm f/2.8 Fisheye equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 26mm on full frame, with a 70.4° horizontal and 80.6° diagonal field of view. These figures are calculated from the focal length and crop factor.
