Comparison of Canon EF 100mm ƒ/2.8 Macro USM and Pentax SMC P-FA 100mm f/2.8 Macro [S]ave
| Attribute |  Canon EF 100mm ƒ/2.8 Macro USM × |  Pentax SMC P-FA 100mm f/2.8 Macro × |
|---|---|---|
| Diagonal Angle of View (degree) | 24.00 | 24.50 |
| Filter Size (mm) | 58 | 58 |
| Aperture (f) | 2.80 - 32.00 | 2.80 - 32.00 |
| Closest Focus (m) | 0.31 | 0.3 |
| Magnification Ratio (x) | 1 | 1 |
| Type | Telephoto Prime Macro | Telephoto Prime Macro |
| Focus Details | Inner focusing; full-time manual focus and USM | Internal, manual override |
| APS Equivalent | 160mm | 150mm |
| Diaphragm Blades | 8 | 8 |
| Image Circle | 35mm | 35mm |
| Focal Length (mm) | 100.00 | 100.00 |
| Brand | Canon | Pentax |
| Name | Canon EF 100mm ƒ/2.8 Macro USM | Pentax SMC P-FA 100mm f/2.8 Macro |
| Weight (g) | 600 | 601 |
| Diameter (mm) | 79 | 74 |
| Length (mm) | 119 | 102 |
| Notes | - | Distance scale, Focus range limiter, Focus clamp screw |
| Lens Construction | 12 elements in 8 groups, including 2 aspherical elements | 9 elements in 8 groups |
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