Comparison of Olympus 17mm ƒ/1.8 M.Zuiko Digital and Pentax SMC P-DA 21mm f/3.2 AL Limited [S]ave
| Attribute |  Pentax SMC P-DA 21mm f/3.2 AL Limited × |  Olympus 17mm ƒ/1.8 M.Zuiko Digital × |
|---|---|---|
| Diagonal Angle of View (degree) | 68.00 | 65.00 |
| Aperture (f) | 3.20 - 22.00 | 1.80 - 22.00 |
| Diaphragm Blades Type | - | circular |
| Filter Size (mm) | 43 | 46 |
| Notes | Dual filter attachment design: 43mm filters on the hood, and 49mm filters on the lens (without use of the hood). | Includes front and rear plastic lens caps, instruction manual. Optional LH-48B metal lens hood, LC-48B metal lens cap available. |
| APS Equivalent | 31.5mm | - |
| Type | Wide Prime | Wide Prime |
| Diaphragm Blades | 7 | 7 |
| Lens Construction | 8 elements in 5 groups, including 1 hybrid aspherical element | 9 elements in 6 groups, including 1 high refractive and 3 aspherical elements (with a Dual Super aspherical element) |
| Image Circle | APS-C | Image Circle |
| Focal Length (mm) | 21.00 | 17.00 |
| Brand | Pentax | Olympus |
| Name | Pentax SMC P-DA 21mm f/3.2 AL Limited | Olympus 17mm ƒ/1.8 M.Zuiko Digital |
| Weight (g) | 140 | 120 |
| Diameter (mm) | 63 | 57.5 |
| Length (mm) | 25 | 35.5 |
| 35mm Equivalent | - | 34mm |
| Magnification Ratio (x) | 0.17 | 0.08 |
| Focus Details | "Quick Shift" AF/MF mechanism | - |
| Closest Focus (m) | 0.2 | 0.25 |
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