 | |
| Maker | Sigma Corporation |
|---|---|
| Technical data | |
| Type | circular fisheye lens |
| Focus drive | Ultrasonic motor |
| Focal length | 4.5mm |
| Crop factor | 180 degrees |
| Aperture (max/min) | f/2.8 |
| Close focus distance | 13.5cm |
| Max. magnification | 1:6 |
| Diaphragm blades | 6 |
| Construction | 13 elements in 9 groups |
| Features | |
| Short back focus |  No |
| Lens-based stabilization |  No |
| Macro capable | No |
| Unique features | circular fisheye |
| Physical | |
| Max. length | 77.8mm |
| Diameter | 76.2mm |
| Weight | 470g (16.6oz) |
| Filter diameter | rear (Gelatin filter) |
| Accessories | |
| Lens hood | none |
| Angle of view | |
| Horizontal | 180 |
| Vertical | 180 |
| Diagonal | 180 |
| Retail info | |
| MSRP | $1400 USD |
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.
