Comparison of Pentax SMC P-FA 50mm f/1.4 and Sigma 45mm f/2.8 DG DN Contemporary [S]ave
| Attribute |  Sigma 45mm f/2.8 DG DN Contemporary × |  Pentax SMC P-FA 50mm f/1.4 × |
|---|---|---|
| Type | Wide Prime | Standard Prime |
| Diaphragm Blades | 7 | - |
| Name | Sigma 45mm f/2.8 DG DN Contemporary | Pentax SMC P-FA 50mm f/1.4 |
| Weight (g) | 215 | 221 |
| Diameter (mm) | 64 | 64 |
| Brand | Sigma | Pentax |
| APS Equivalent | 1.5x: 67.5mm; 1.6x: 72mm | 75mm |
| Notes | Available AF Mounts: L-Mount, Sony E-Mount | - |
| Closest Focus (m) | 0.24 | 0.46 |
| Lens Construction | 8 elements in 7 groups | 7 elements in 6 groups |
| Filter Size (mm) | 55 | 49 |
| Aperture (f) | 2.80 - 22.00 | 1.40 - 22.00 |
| Diagonal Angle of View (degree) | 51.30 | 47.00 |
| Focus Details | Smooth, quiet and high-speed AF via stepping motor | - |
| Focal Length (mm) | 45.00 | 50.00 |
| Magnification Ratio (x) | 0.25 | - |
| Image Circle | 35mm | 35mm |
| Diaphragm Blades Type | rounded | - |
| Length (mm) | 46.2 | 38 |
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