Summicron-M 66 f/2
| Lens | Leica Summicron-M 66 f/2 |
| Angle of view (diagonal/horizontal/vertical) | |
| Full-frame (24 × 36 mm) | 36.3°/30.5°/20.6° |
| Lens system | |
| Number of lenses/assemblies | 6/5 |
| Position of the entrance pupil before the bayonet | 31.40 mm |
| Focus range | 1 m to infinite |
| Focusing | |
| Scale | Combined scale meters (m)/feet (ft) |
| Smallest object field | Full-frame: 321 × 481 mm |
| Largest scale | 1:13.4 |
| 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 thread | E49 |
| Lens hood | Screw-on |
| Dimensions | |
| Length | Approx. 60.1 mm |
| Diameter | Approx. 60 mm |
| Weight | Approx. 456 g |
