| Principal specifications | ||
|---|---|---|
| Lens type | Prime lens | |
| Max Format size | 35mm FF | |
| Focal length | 21 mm | |
| Image stabilisation | No | |
| Lens mount | Leica M | |
| Aperture | ||
| Maximum aperture | F2.8 | |
| Minimum aperture | F16.0 | |
| Aperture ring | Yes | |
| Number of diaphragm blades | 9 | |
| Aperture notes | with clickstops (including half values), manual diaphragm | |
| Optics | ||
| Elements | 9 | |
| Groups | 7 | |
| Special elements / coatings | 1 aspherical element | |
| Focus | ||
| Minimum focus | 0.70 m (27.56″) | |
| Maximum magnification | 0.034 x | |
| Autofocus | No | |
| Full time manual | Unknown | |
| Distance scale | Yes | |
| DoF scale | Yes | |
| Physical | ||
| Weight | 300 g (0.66 lb) | |
| Diameter | 58 mm (2.28″) | |
| Length | 46 mm (1.81″) | |
| Materials | metal barrel, metal mount | |
| Colour | black anodized or silver chrome finish | |
| Filter thread | 55 mm | |
| Hood supplied | Yes | |
| Hood product code | 12 592 | |
| Tripod collar | No | |
| Other | ||
| Notes | silver chrome version weighs 415g | |
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