Comparison of Canon EF 100-300mm f/4.5-5.6 USM and Pentax 55-300mm f/4-5.8 ED WR HD DA [S]ave
| Attribute |  Canon EF 100-300mm f/4.5-5.6 USM × |  Pentax 55-300mm f/4-5.8 ED WR HD DA × |
|---|---|---|
| Filter Size (mm) | 58 | 58 |
| Aperture (f) | 4.50 - 38.00 | 4.00 - 32.00 |
| Closest Focus (m) | 1.5 | 1.4 |
| Magnification Ratio (x) | 0.2 | 0.28 |
| Type | Telephoto Zoom | Telephoto Zoom |
| Focus Details | Inner focusing; full-time manual focus and USM | Quick-shift Focus System |
| APS Equivalent | 160 - 480mm | 82.5 - 450mm |
| Diameter (mm) | 73 | 71 |
| Image Circle | 35mm | APS-C |
| Focal Length (mm) | 100.00 - 300.00 | 55.00 - 300.00 |
| Brand | Canon | Pentax |
| Name | Canon EF 100-300mm f/4.5-5.6 USM | Pentax 55-300mm f/4-5.8 ED WR HD DA |
| Weight (g) | 540 | 466 |
| Diagonal Angle of View (degree) | 8.30 - 24.00 | 5.40 - 29.00 |
| Diaphragm Blades | 8 | 6 |
| Zoom System | Rotary | Rotary |
| Length (mm) | 121 | 111.5 |
| Notes | - | Weather resistant; PENTAX SP coating protects exposed lens elements; Included Accessories: lens hood, lens cap, rear lens cap, soft lens case. |
| Lens Construction | 13 elements in 10 groups | 12 elements in 8 groups, including ED elements |
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