Comparison of Canon EF 400mm f/5.6L USM and Pentax 300mm f/4 ED IF SDM SMC DA* [S]ave
| Attribute |  Canon EF 400mm f/5.6L USM × |  Pentax 300mm f/4 ED IF SDM SMC DA* × |
|---|---|---|
| Aperture (f) | 5.60 - 32.00 | 4.00 - 32.00 |
| Filter Size (mm) | 77 | 77 |
| Notes | Built-in hood; detachable tripod mount | Included Accessories: PH-RBK Hood, Detachable Tripod Mount, Case |
| Closest Focus (m) | 3.5 | 1.4 |
| Magnification Ratio (x) | 0.12 | 0.24 |
| Type | Telephoto Prime | Telephoto Prime |
| Focus Details | Inner focusing; full-time manual focus and USM | Internal, SDM (Supersonic Motor) with Quick-shift Focus System |
| APS Equivalent | 640mm | 450mm |
| Diaphragm Blades | 8 | 9 |
| Image Circle | 35mm | APS-C |
| Focal Length (mm) | 400.00 | 300.00 |
| Brand | Canon | Pentax |
| Name | Canon EF 400mm f/5.6L USM | Pentax 300mm f/4 ED IF SDM SMC DA* |
| Weight (g) | 1250 | 1070 |
| Diagonal Angle of View (degree) | 6.20 | 5.40 |
| Length (mm) | 256 | 184 |
| Diameter (mm) | 90 | 83 |
| Lens Construction | 7 elements in 6 groups, including 1 UD and 1 S-UD element | 8 elements in 6 groups |
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