| Pentax smc DA 21mm F3.2 AL Limited | |
| Maker: | Pentax |
| Mount: | Pentax K |
| Focusdrive: | Screwdrive |
| Feat-Ws: | n |
| Feat-Is: | n |
| Feat-Ar: | n |
| Feat-Mfo: | y |
| Type: | p |
| Flength: | 21mm |
| Flength-Eq: | 32mm |
| Aperture: | f/3.2 |
| Elements: | 8 |
| Groups: | 5 |
| Diaphragm: | 7 |
| Close-Dist: | 0.2m (00.7feet) |
| Max-Dist: | Infinity |
| Max-Mag: | 0.17 |
| Max-Diameter: | 63mm |
| Max-Length: | 25mm |
| Weight: | 140g |
| Filter: | 49mm |
| Start: | 2006 |
The Pentax smc DA 21mm F3.2 AL Limited is a moderate wide angle lens announced by Pentax on February 13, 2006. It is one of the five very compact "Limited" prime lenses for APS-C format cameras. Like its siblings, it was replaced in 2013 with a version that is HD-coated and has rounded aperture blades.