Apochromatic colour correction and an aspherical lens surface are combined for the first time in this lens of this type. Of its five individual elements, two are made of high-refraction glass, while two others feature anomalous partial dispersion. Its brilliance and quality of resolution are exemplary even at full aperture. Light falloff is very low. Its fast aperture, for a 90 mm lens, lets you shoot at relatively short exposure times even in dim light, helping to minimize the effects of camera shake, for instance when photographing street scenes from a distance.
Tech Specs
| Angle of view (diagonal, horizontal, vertical) | 27°, 23°, 15° |
| Optical design | |
| Number of lenses/groups | 5 / 5 |
| Focal length | 90.9 mm |
| Position of entrance pupil | 58.6 mm (related to the first lens surface in light direction) |
| Focusing range | 1 m to Infinity |
| Distance setting | |
| Scales | Combined meter/feet graduation |
| Smallest object field | 220 mm x 330 mm |
| Largest reproduction ratio | 1:9 |
| Aperture | |
| Setting/Function | With click-stops, half values available, manual diaphragm |
| Lowest value | 16 |
| Bayonet | Leica M quick-change bayonet with 6 bit lens identification bar code for digital M models |
| Filter mount | Internal thread for screw-in type filters E 55 |
| Lens hood | Built-in, telescopic |
| Dimension and weight: | |
| Length | 78 mm |
| Largest diameter | 64 mm |
| Weight | approx. 500 g |