Lens details
| Mounts | Pentax K |
| Lensname | Pentax 21 F/3.2 SMC -DA AL Limited pancake |
| Focallength | 21 mm |
| Speed | F/3.2 |
| Stabilisation | 0 stops |
| Min. focusdistance | 20 cm |
| Size | 63 x 25 mm |
| Weight | 140 grams |
| Filtersize | 43 or 49 mm |
| Autofocus | Micromotor |
| Aperture blades | 7 blades |
| Minimal aperture | F/22 |
| Elements / groups | 8 / 5 |
| Magnification | 0.17 |
| Hood | 21590, supplied |
| F-stop breakdown | N/A |
| Other info |
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