| Attribute | Value |
|---|---|
| Lens Construction | 5 elements in 4 groups |
| Diameter | 63 mm |
| Diagonal Angle of View | 39.00 degree |
| Aperture | 2.80 - 22.00 f |
| Notes | Distance scale |
| Filter Size | 5 mm |
| Magnification Ratio | 0.13 x |
| Closest Focus | 0.4 m |
| Focus Details | "Quick Shift" AF/MF mechanism |
| Length | 15 mm |
| Diaphragm Blades | 9 |
| APS Equivalent | 60mm |
| Focal Length | 40.00 mm |
| Image Circle | APS-C (but we found it didn't vignette on a 35mm film body) |
| Brand | Pentax |
| Name | Pentax SMC P-DA 40mm f/2.8 Limited |
| Weight | 90 g |
| Type | Standard Prime |
| 35mm Equivalent | Add |
| Effective Reduction in Aperture | Add |
| Focal Length Multiplier | Add |
| APS-C Equivalent | Add |
| Zoom System | Add |
| Diaphragm Blades Type | Add |
| Front Element Rotation | Add |