Quick answer
The Sigma 4.5mm f/2.8 EX DC HSM circular fisheye is a ultra-wide fisheye lens covering 4mm at f/2.8 for the Canon EF mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
A 4.5mm f/2.8 APS-C fisheye lens, the Sigma 4.5mm f/2.8 EX DC HSM circular fisheye is designed for Canon EF mount bodies, with Hyper Sonic Motor autofocus. It suits dramatic perspectives, astrophotography and creative wide-field work.
Sigma 4.5mm f/2.8 EX DC HSM circular fisheye specifications
- Brand
- Sigma
- Mount
- Canon EF
- Focal length
- 4mm
- Maximum aperture
- f/2.8
- Lens type
- Fisheye
- Format coverage
- aps-c
- Optical construction
- 13 elements in 9 groups
- Aperture blades
- 6
- Autofocus motor
- HSM
- Minimum focus distance
- 0.14 m
- Maximum magnification
- 0.17x
- Weight
- 470 g
- Length
- 77.8 mm
- Diameter
- 76.2 mm
Specification source: sigmaphoto.com
What can you shoot with the Sigma 4.5mm f/2.8 EX DC HSM circular fisheye?
At 4mm 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 |
|---|---|---|---|---|
| APS-C | 1.6x | 7.2mm | 136.4° | 143.2° |
Frequently asked questions
What mount does the Sigma 4.5mm f/2.8 EX DC HSM circular fisheye use?
It uses the Canon EF mount, so it fits Canon EF cameras directly.
What is the focal length of the Sigma 4.5mm f/2.8 EX DC HSM circular fisheye?
It is a fixed 4mm lens with a maximum aperture of f/2.8. That makes it a ultra-wide lens.
Is the Sigma 4.5mm f/2.8 EX DC HSM circular fisheye a prime or a zoom lens?
It is a prime lens with a fixed 4mm focal length. Primes usually open wider than zooms; this one opens to f/2.8.
What is the Sigma 4.5mm f/2.8 EX DC HSM circular fisheye equivalent on a crop sensor?
On APS-C (1.6x crop) it frames like 7.2mm on full frame, with a 136.4° horizontal and 143.2° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Sigma 4.5mm f/2.8 EX DC HSM circular fisheye fit?
Any Canon EF-mount camera, including Canon EOS 1D X, Canon EOS 5D, Canon EOS 5D Mark II, Canon EOS 5D Mark III, and Canon EOS 5D Mark IV and 7 more.
