Comparison of Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM and Sony SAL-16F28 16mm f/2.8 Fisheye [S]ave
| Attribute |  Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM × |  Sony SAL-16F28 16mm f/2.8 Fisheye × |
|---|---|---|
| Notes | Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony; Included Accessories: Gelatin Filter Holder, Padded Case | Included Accessories: SH0007 Petal Lens Hood |
| Aperture (f) | 2.80 - 22.00 | 2.80 - 22.00 |
| Closest Focus (m) | 0.14 | 0.21 |
| Magnification Ratio (x) | 0.17 | 0.15 |
| Length (mm) | 77.8 | 66.5 |
| Focus Details | Internal; HSM with full-time manual focus override | Rear focusing |
| APS Equivalent | 1.5x: 6.8mm; 1.6x: 7.2mm | 24mm |
| Type | Wide Prime | Fisheye Prime |
| Image Circle | APS-C | 35mm |
| Focal Length (mm) | 4.50 | 16.00 |
| Brand | Sigma | Sony |
| Name | Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM | Sony SAL-16F28 16mm f/2.8 Fisheye |
| Weight (g) | 470 | 400 |
| Diagonal Angle of View (degree) | 180.00 | 180.00 |
| Diaphragm Blades | 6 | 7 |
| Diameter (mm) | 76.2 | 75 |
| Lens Construction | 13 Elements in 9 Groups | 11 elements in 8 groups |
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