Comparison of Canon EF 800mm f/5.6L IS USM and Pentax SMC P-FA 250-600mm f/5.6 ED IF [S]ave
| Attribute |  Canon EF 800mm f/5.6L IS USM × |  Pentax SMC P-FA 250-600mm f/5.6 ED IF × |
|---|---|---|
| Filter Size (mm) | 52 | 43 |
| Notes | Image Stabilization | - |
| Closest Focus (m) | 6 | 3.5 |
| Magnification Ratio (x) | 0.14 | 0.2 |
| APS Equivalent | - | 375 - 900mm |
| Focus Details | Internal focusing; full-time manual focus and USM | Internal |
| Focal Length (mm) | 800.00 | 250.00 - 600.00 |
| Diagonal Angle of View (degree) | 3.08 | 4.10 - 9.90 |
| Brand | Canon | Pentax |
| Image Circle | 35mm | 35mm |
| Name | Canon EF 800mm f/5.6L IS USM | Pentax SMC P-FA 250-600mm f/5.6 ED IF |
| Weight (g) | 4500 | 5049 |
| Type | Telephoto Prime | Telephoto Zoom |
| Aperture (f) | 5.60 - 32.00 | 5.60 - 32.00 |
| Diaphragm Blades | 8 | - |
| Diaphragm Blades Type | circular | - |
| Lens Construction | 18 elements in 14 groups, including 1 UD, 1 Super-UD-glass and 2 fluorite elements | 18 elements in 16 groups, including 1 ED element |
| Diameter (mm) | 162 | 71 |
| Length (mm) | 461 | 442 |
| Zoom System | - | Rotary with lock |
| APS-C Equivalent | 1280mm | - |
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