| Lens | Leica Super-Elmar 21 f/3.4 ASPH. |
| Order number | 11145 |
| Viewing angle (diagonal/horizontal/vertical) Full-frame (24 × 36 mm) |
91°/80°/59° |
| Lens arrangement | |
| Number of lenses/assemblies | 8/7 |
| Number of aspherical surfaces | 2 |
| Position of the entrance pupil before the bayonet | 15.6 mm |
| Focus range | 0.7 m to ∞ (2.3 ft to ∞) |
| Focusing | |
| Scale | Combined scale meter (m)/feet (ft) |
| Smallest object field | Full-frame: 706 × 1059 mm |
| Largest scale | 1:29.8 |
| Diaphragm | |
| Setting/Function | Click-stop diaphragm with half-increment lock settings |
| Smallest aperture | 16 |
| Bayonet | Leica M bayonet with 6-bit encoding |
| Filter (type) | E46 |
| Lens hood | Separate, screw-on |
| Dimensions | |
| Length | Approx. 1.7 in |
| Diameter | Approx. 2.1 in |
| Weight | Approx. 10.5 oz |
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