Comparison of Olympus 50mm ƒ/1.8 OM Zuiko and Sigma 45mm f/2.8 DG DN Contemporary [S]ave
| Attribute |  Sigma 45mm f/2.8 DG DN Contemporary × |  Olympus 50mm ƒ/1.8 OM Zuiko × |
|---|---|---|
| 35mm Equivalent | - | 50mm |
| Diagonal Angle of View (degree) | 51.30 | 47.00 |
| Diameter (mm) | 64 | 59 |
| Notes | Available AF Mounts: L-Mount, Sony E-Mount | Discontinued |
| Aperture (f) | 2.80 - 22.00 | 1.80 - 16.00 |
| Magnification Ratio (x) | 0.25 | - |
| Type | Wide Prime | Standard Prime |
| Diaphragm Blades | 7 | 6 |
| Lens Construction | 8 elements in 7 groups | 6 elements in 4 groups |
| Image Circle | 35mm | Image Circle |
| Focal Length (mm) | 45.00 | 50.00 |
| Brand | Sigma | Olympus |
| Name | Sigma 45mm f/2.8 DG DN Contemporary | Olympus 50mm ƒ/1.8 OM Zuiko |
| Weight (g) | 215 | 170 |
| Focus Details | Smooth, quiet and high-speed AF via stepping motor | - |
| Length (mm) | 46.2 | 31 |
| APS Equivalent | 1.5x: 67.5mm; 1.6x: 72mm | - |
| Filter Size (mm) | 55 | 49 |
| Diaphragm Blades Type | rounded | - |
| Closest Focus (m) | 0.24 | 0.45 |
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