Comparison of Canon EF 24mm f/2.8 and Pentax SMC P-FA 20mm f/2.8 [S]ave
| Attribute |  Canon EF 24mm f/2.8 × |  Pentax SMC P-FA 20mm f/2.8 × |
|---|---|---|
| Brand | Canon | Pentax |
| Name | Canon EF 24mm f/2.8 | Pentax SMC P-FA 20mm f/2.8 |
| Focal Length (mm) | 24.00 | 20.00 |
| Image Circle | 35mm | 35mm |
| Diaphragm Blades | 6 | - |
| APS Equivalent | 39mm | 30mm |
| Focus Details | Rear element inner focusing | - |
| Length (mm) | 48 | 44 |
| Magnification Ratio (x) | 0.16 | 0.12 |
| Closest Focus (m) | 0.25 | 0.24 |
| Filter Size (mm) | 58 | 67 |
| Aperture (f) | 2.80 - 22.00 | 2.80 - 22.00 |
| Diagonal Angle of View (degree) | 84.00 | 94.00 |
| Weight (g) | 270 | 255 |
| Lens Construction | 10 elements in 10 groups | 10 elements in 9 groups |
| Type | Wide Prime | Wide Prime |
| Diameter (mm) | 67 | 70 |
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