| Maker | Ricoh Imaging |
|---|---|
| Lens mount(s) | Pentax KAF3 |
| Technical data | |
| Type | Zoom |
| Focus drive | Brushless DC motor |
| Focal length | 20-40mm |
| Aperture (max/min) | f/2.8 - f/4.0 |
| Close focus distance | 0.28 metres (0.92 ft) |
| Max. magnification | 0.2 |
| Diaphragm blades | 9 |
| Construction | 9 elements in 8 groups |
| Features | |
| Manual focus override |  Yes |
| Weather-sealing | Yes |
| Lens-based stabilization |  No |
| Aperture ring | No |
| Physical | |
| Diameter | 71 millimetres (2.8 in) |
| Weight | 283 grams (0.624 lb) |
| Filter diameter | 55mm |
| Accessories | |
| Lens hood | MH-RA55 |
| History | |
| Introduction | 2013 |
The HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR is an advanced standard zoom lens for Pentax APS-C DSLR cameras announced by Ricoh on November 6, 2013. Being part of Pentax's Limited series, it features a metal barrel and a comparably small form factor. Within the Limited series, it is the first zoom lens as well as the first lens to feature a silent built-in autofocus motor (DC) and weather resistance (WR).
