Comparison of Pentax SMC P-FA 20mm f/2.8 and Sigma 24mm f/3.5 DG DN Contemporary [S]ave
| Attribute |  Pentax SMC P-FA 20mm f/2.8 × |  Sigma 24mm f/3.5 DG DN Contemporary × |
|---|---|---|
| Diagonal Angle of View (degree) | 94.00 | 84.10 |
| Diameter (mm) | 70 | 64 |
| Filter Size (mm) | 67 | 55 |
| Aperture (f) | 2.80 - 22.00 | 3.50 - 22.00 |
| Type | Wide Prime | Wide Prime |
| Magnification Ratio (x) | 0.12 | 0.5 |
| APS Equivalent | 30mm | 1.5x: 36mm |
| Notes | - | Available AF Mounts: L-Mount, Sony E-Mount |
| Image Circle | 35mm | 35mm |
| Focal Length (mm) | 20.00 | 24.00 |
| Brand | Pentax | Sigma |
| Name | Pentax SMC P-FA 20mm f/2.8 | Sigma 24mm f/3.5 DG DN Contemporary |
| Weight (g) | 255 | 225 |
| Diaphragm Blades | - | 7 |
| Lens Construction | 10 elements in 9 groups | 10 elements in 8 groups, with 1 SLD glass and 3 aspherical lenses |
| Focus Details | - | Smooth, quiet and high-speed AF via stepping motor |
| Length (mm) | 44 | 48.8 |
| Diaphragm Blades Type | - | rounded |
| Closest Focus (m) | 0.24 | 0.11 |
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