Comparison of Nikon 400mm f/2.8G IF-ED AF-S VR Nikkor and Pentax SMC P-FA 600mm f/4 ED IF [S]ave
| Attribute |  Pentax SMC P-FA 600mm f/4 ED IF × |  Nikon 400mm f/2.8G IF-ED AF-S VR Nikkor × |
|---|---|---|
| Filter Size (mm) | 43 | 52 |
| Closest Focus (m) | 5 | 2.9 |
| Magnification Ratio (x) | - | 0.16 |
| Length (mm) | 457 | 368 |
| Focus Details | Internal | Internal; Silent Wave Motor; M/A switch |
| Diaphragm Blades Type | - | rounded |
| Zoom System | - | n/a |
| Image Circle | 35mm | 35mm |
| Focal Length (mm) | 600.00 | 400.00 |
| Name | Pentax SMC P-FA 600mm f/4 ED IF | Nikon 400mm f/2.8G IF-ED AF-S VR Nikkor |
| Brand | Pentax | Nikon |
| Weight (g) | 6450 | 4620 |
| Type | Telephoto Prime | Telephoto Prime |
| Lens Construction | 9 elements in 7 groups | 14 elements in 11 groups, including 3 ED glass elements, one Nano Crystal Coat and one meniscus protective glass element |
| Notes | Included Accessories: Case | Image Stabilization |
| APS Equivalent | 900mm | 600mm |
| Aperture (f) | 4.00 - 32.00 | 2.80 - 22.00 |
| Diaphragm Blades | - | 9 |
| Diagonal Angle of View (degree) | 4.10 | 6.20 |
| Diameter (mm) | 175 | 159.5 |
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