Comparison of Olympus 8mm ƒ/1.8 Pro M.Zuiko Digital ED Fisheye and Sigma 8mm f/4 EX DG Circular Fisheye [S]ave
| Attribute |  Olympus 8mm ƒ/1.8 Pro M.Zuiko Digital ED Fisheye × |  Sigma 8mm f/4 EX DG Circular Fisheye × |
|---|---|---|
| Weight (g) | 313 | 320 |
| Brand | Olympus | Sigma |
| Name | Olympus 8mm ƒ/1.8 Pro M.Zuiko Digital ED Fisheye | Sigma 8mm f/4 EX DG Circular Fisheye |
| Focal Length (mm) | 8.00 | 8.00 |
| Image Circle | Image Circle | 35mm |
| Length (mm) | 80 | 63 |
| Diaphragm Blades | 7 | 5 |
| Magnification Ratio (x) | 0.2 | 0.07 |
| Closest Focus (m) | 0.12 | 0.2 |
| Aperture (f) | 1.80 - 22.00 | 4.00 - 32.00 |
| Notes | Weather sealed; Fixed lens hood and a pinch-style lens cap LC-62 included. | Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax; Included Accessories: Gelatin Filter Holder, Fitted, Padded Case |
| Diaphragm Blades Type | circular | - |
| Diagonal Angle of View (degree) | 180.00 | 180.00 |
| Diameter (mm) | 62 | 73.5 |
| Type | Fisheye Prime | Fisheye Prime |
| Lens Construction | 17 elements in 15 groups, including 1 aspherical, 3 Super ED, 2 ED, 1 Super HR, and 2 HR elements | 10 Elements in 6 Groups |
| APS Equivalent | - | 1.5x: 12mm; 1.6x: 12.8mm |
| 35mm Equivalent | 16mm | - |
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