| Attribute | Value |
|---|---|
| Lens Construction | 8 elements in 5 groups, including 1 hybrid aspherical element |
| Diameter | 63 mm |
| Diagonal Angle of View | 68.00 degree |
| Diaphragm Blades Type | rounded |
| Aperture | 3.20 - 22.00 f |
| Notes | Available in black or silver; Dual filter attachment design: 43mm filters on the hood, and 49mm filters on the lens (without use of the hood) |
| Filter Size | 43 mm |
| Magnification Ratio | 0.17 x |
| Closest Focus | 0.2 m |
| Focus Details | "Quick Shift" AF/MF mechanism |
| Length | 25 mm |
| Diaphragm Blades | 7 |
| APS Equivalent | 32mm |
| Focal Length | 21.00 mm |
| Image Circle | APS-C |
| Brand | Pentax |
| Name | Pentax 21mm f/3.2 AL Limited HD DA |
| Weight | 134 g |
| Type | Wide Prime |
| 35mm Equivalent | Add |
| Effective Reduction in Aperture | Add |
| Focal Length Multiplier | Add |
| APS-C Equivalent | Add |
| Zoom System | Add |
| Front Element Rotation | Add |