Comparison of Nikon 20mm f/2.8 AIS Nikkor and Pentax SMC P-FA 20mm f/2.8 [S]ave
| Attribute |  Nikon 20mm f/2.8 AIS Nikkor × |  Pentax SMC P-FA 20mm f/2.8 × |
|---|---|---|
| Name | Nikon 20mm f/2.8 AIS Nikkor | Pentax SMC P-FA 20mm f/2.8 |
| Image Circle | 35mm (FX) | 35mm |
| Brand | Nikon | Pentax |
| APS Equivalent | 30mm | 30mm |
| Focal Length (mm) | 20.00 | 20.00 |
| Diagonal Angle of View (degree) | 94.00 | 94.00 |
| Diaphragm Blades | 7 | - |
| Closest Focus (m) | 0.25 | 0.24 |
| Focus Details | Manual Focus Only; Close Range Correction | - |
| Filter Size (mm) | 62 | 67 |
| Magnification Ratio (x) | 0.12 | 0.12 |
| Notes | Classic Nikon F Mount; AIS / AI / NAI Metering Compatibility; Includes front and rear lens caps. | - |
| Aperture (f) | 2.80 - 22.00 | 2.80 - 22.00 |
| Length (mm) | 43 | 44 |
| Weight (g) | 260 | 255 |
| Lens Construction | 12 elements in 9 groups | 10 elements in 9 groups |
| Type | Wide Prime | Wide Prime |
| Diameter (mm) | 66 | 70 |
Help · Contact us · Disclaimer · Contributors · Developers · Donate