| Sigma 4.5mm f/2.8 EX DC circular fisheye | |
| Maker: | Sigma Corporation |
| Feat-Is: | n |
| Focusdrive: | Ultrasonic motor |
| Feat-Sbf: | n |
| Feat-Macro: | n |
| Feat-Special: | circular fisheye |
| Type: | circular fisheye lens |
| Flength: | 4.5mm |
| Fov: | 180 degrees |
| Aperture: | f/2.8 |
| Groups: | 9 |
| Elements: | 13 |
| Diaphragm: | 6 |
| Close-Dist: | 13.5cm |
| Max-Mag: | 1:6 |
| Max-Diameter: | 76.2mm |
| Max-Length: | 77.8mm |
| Weight: | 470g (16.6oz) |
| Filter: | rear (Gelatin filter) |
| Hood: | none |
| Av-Horiz: | 180 |
| Av-Vert: | 180 |
| Av-Diag: | 180 |
| Msrp: | $1400 |
The Sigma 4.5mm f/2.8 EX DC circular fisheye is a photographic lens manufactured by Sigma Corporation. It is a circular fisheye lens, designed to project a 180-degree field of view in all directions onto a circular image. It is the first such lens to provide the complete circular fisheye effect on crop factor digital SLR cameras, which do not have a full 36x24mm sensor.[1] This lens is available in Canon, Nikon, Sigma, Pentax and Sony mounts.
This lens projects a 13mm image circle, which fits nicely in a Micro Four Thirds system frame with an adapter.