| Sigma 8mm f/3.5 EX DG circular fisheye | |
| Maker: | Sigma Corporation |
| Feat-Is: | n |
| Feat-Usm: | n |
| Feat-Sbf: | n |
| Feat-Macro: | n |
| Feat-Special: | circular fisheye |
| Type: | circular fisheye lens |
| Flength: | 8mm |
| Fov: | 180 degrees |
| Aperture: | f/3.5 |
| Groups: | 6 |
| Elements: | 11 |
| Diaphragm: | 6 |
| Close-Dist: | 13.5cm |
| Max-Mag: | 1:4.6 |
| Max-Diameter: | 73.5mm |
| Max-Length: | 68.6mm |
| Weight: | 400g (14.0oz) |
| Filter: | rear (Gelatin filter) |
| Hood: | none |
| Av-Horiz: | 180 |
| Av-Vert: | 180 |
| Av-Diag: | 180 |
| Msrp: | $1230 |
The Sigma 8mm f/3.5 EX DG is a photographic lens introduced on 9 August 2006. It is a circular fisheye lens, designed to project a 180-degree field of view in all directions onto a circular image when used on a full-frame camera. The lens is available in Canon, Nikon, and Sigma mounts.