Comparison of Panasonic 8mm f/3.5 Lumix G Fisheye and Pentax SMC P-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF [S]ave
| Attribute |  Pentax SMC P-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF × |  Panasonic 8mm f/3.5 Lumix G Fisheye × |
|---|---|---|
| Filter Size (mm) | - | 22 |
| Notes | Distance scale, Integrated lens hood; no filter ring or rear-element filter clip | Included accessories: Lens caps, storage bag |
| Closest Focus (m) | 0.14 | 0.1 |
| Magnification Ratio (x) | 0.39 | 0.2 |
| APS Equivalent | 15 - 25.5mm | - |
| Focus Details | "Quick-Shift" Focus System for instant shift to manual focus | Internal; Stepper Motor |
| Focal Length (mm) | 10.00 - 17.00 | 8.00 |
| Diagonal Angle of View (degree) | 100.00 - 180.00 | 180.00 |
| Brand | Pentax | Panasonic |
| Image Circle | APS-C | Micro Four-Thirds |
| Name | Pentax SMC P-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF | Panasonic 8mm f/3.5 Lumix G Fisheye |
| Weight (g) | 320 | 165 |
| Type | Fisheye Zoom | Fisheye Prime |
| Aperture (f) | 3.50 - 32.00 | 3.50 - 22.00 |
| Diaphragm Blades | 6 | 7 |
| Diaphragm Blades Type | - | rounded |
| Lens Construction | 10 elements in 8 groups | 10 elements in 9 groups, including 1 ED element |
| Diameter (mm) | 68 | 60.7 |
| Length (mm) | 71.5 | 51.7 |
| Zoom System | Rotary | - |
| 35mm Equivalent | - | 16mm |
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