| Attribute | Value |
|---|---|
| Length | 68.5 mm |
| Type | Wide Prime |
| Weight | 345 g |
| Name | Pentax SMC P-FA 31mm f/1.8 AL Limited |
| Brand | Pentax |
| Image Circle | 35mm |
| Focal Length | 31.00 mm |
| APS Equivalent | 46.5mm |
| Lens Construction | 9 elements in 7 groups, including 1 aspherical element |
| Closest Focus | 0.3 m |
| Magnification Ratio | 0.16 x |
| Filter Size | 58 mm |
| Aperture | 1.80 - 22.00 f |
| Diagonal Angle of View | 70.00 degree |
| Diameter | 65 mm |
| 35mm Equivalent | Add |
| Effective Reduction in Aperture | Add |
| Focal Length Multiplier | Add |
| APS-C Equivalent | Add |
| Zoom System | Add |
| Diaphragm Blades Type | Add |
| Notes | Add |
| Front Element Rotation | Add |
| Focus Details | Add |
| Diaphragm Blades | Add |