Comparison of Nikon 400mm f/2.8D ED-IF II AF-S 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/2.8D ED-IF II AF-S Nikkor × |
|---|---|---|
| Closest Focus (m) | 5 | 3.5 |
| Magnification Ratio (x) | - | 0.13 |
| Length (mm) | 457 | 353 |
| Focus Details | Internal | Internal; Silent Wave motor; M/A switch |
| Zoom System | - | n/a |
| Diaphragm Blades | - | 9 |
| Image Circle | 35mm | 35mm |
| Aperture (f) | 4.00 - 32.00 | 2.80 - 22.00 |
| Name | Pentax SMC P-FA 600mm f/4 ED IF | Nikon 400mm f/2.8D ED-IF II AF-S Nikkor |
| Brand | Pentax | Nikon |
| Weight (g) | 6450 | 4400 |
| Type | Telephoto Prime | Telephoto Prime |
| Lens Construction | 9 elements in 7 groups | 11 Elements in 9 groups, including 3 ED elements |
| Filter Size (mm) | 43 | 52 |
| Focal Length (mm) | 600.00 | 400.00 |
| Notes | Included Accessories: Case | Included Accessories: CT-402 Trunk Case, HK-27 Hood, LN-1 Strap, 52mm Filter Holder, Gel Filter Holder |
| APS Equivalent | 900mm | 600mm |
| Diagonal Angle of View (degree) | 4.10 | 6.20 |
| Diameter (mm) | 175 | 160 |
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