| Angle of view (diagonal, horizontal, vertical) | |
| For 35mm format (24x36mm) | 91°, 80°, 59° |
| For M8/M8.2 (18x27mm) | 74°, 64°, 46° |
| Optical design | |
| Number of elements / groups | 8 / 7 |
| Focal length | 21 mm |
| Entrance pupil | 15.6 mm (related to the apex of the first lens surface in light direction) |
| Focusing range | 0.7 m (2.3 ft) to Infinity |
| Distance setting | |
| Scale | combined meter/feet-increments |
| Smallest object field | 706 mm x 1059 mm (35mm format) 530 mm x 795 mm (for M8/M8.2) |
| Highest reproduction ratio | 1:29.4 |
| Aperture | |
| Setting / Type | Preset, with clickstops (including half values), manual diaphragm |
| Smallest aperture | f/16 |
| Bayonet | Leica M quick-change bayonet with 6-bit bar coding for digtal Leica models |
| Filter (type) | internal thread for screw-on filters size E 46 |
| Lens hood | outer threading with stop for mounting the metal lens hood |
| Dimensions and weight | |
| Length | 43 mm (1.69 in) / 55 mm (2.17 in) (with/without lens hood attached) |
| Largest diameter | 53 mm / 2.1 in |
| Weight | approx. 279 g / 9.84 oz |
| Accessories included | Metal lens hood, front cap for lens hood, rear cap, leather case, instruction manual |
