| Lens | Leica Summilux-M 21 f/1.4 ASPH. |
| Order number | 11647 |
| View angle (diagonal/horizontal/vertical) Full-frame (24 × 36 mm) |
92°/81°/59° |
| Lens system | |
| Number of lenses/assemblies | 10/8 |
| Number of aspherical surfaces | 2 |
| Position of the entrance pupil before the bayonet | 24.4 mm |
| Focus range | 0.7 m to ∞ |
| Focusing | |
| Scale | Combined scale meter (m)/foot (ft) |
| Smallest object field | Full-frame: 685 × 1027 mm |
| Largest scale | 1:29 |
| Diaphragm | |
| Setting/Function | Click-stop diaphragm with half-increment lock settings |
| Smallest aperture | 16 |
| Number of diaphragm blades | 9 |
| Bayonet | Leica M bayonet with 6-bit encoding |
| Filter (type) | Series VII filter for insertion in lens hood |
| Lens hood | Separate, screw-on |
| Dimensions | |
| Length | Approx. 66 mm |
| Diameter | Approx. 69.5 mm |
| Weight | Approx. 580 g |
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