| Lens Specifications | |
|---|---|
| Name | Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM |
| Image Circle | APS-C |
| Type | Wide Prime |
| Focal Length | 4.5mm |
| APS Equivalent | 1.5x: 6.8mm; 1.6x: 7.2mm |
| Max Aperture | f/2.8 |
| Min Aperture | f/22 |
| Diaphragm Blades | 6 |
| Lens Construction | 13 Elements in 9 Groups |
| Diagonal Angle of View(Based on image circle) | 180 degrees |
| Focus Details | Internal; HSM with full-time manual focus override |
| Front Element Rotation | No |
| Zoom System | n/a |
| Closest Focus | 13.5cm / 5.3 in. |
| Magnification Ratio | 0.17x / 1:6 |
| Filter Size | Rear (Gelatin Filter) |
| Dimensions(Length x Diameter) | 77.8mm x 76.2mm / 3.1 in. x 3.0 in. |
| Weight | 470g / 16.6 oz. |
| Notes | Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony; Included Accessories: Gelatin Filter Holder, Padded Case |
| Typical Online Price | US$1,400 |
