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APO-SUMMICRON-M 90 mm f/2 ASPH.
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This lens is unique because apochromatic correction and an aspherical surface are combined for the first time. Two of the five lens elements are made of high-refraction optical glass, and two others make judicious use of anomalous partial dispersion. Brilliance and resolving power are already outstanding at full aperture. Artificial vignetting is extremely low. These features lead to superlative results – in every application: such as portraiture, reportage or studio photography. In addition, its compact design and high speed make it ideal for hand-held photography. |
| Angle of view | 27° |
| Optical design | Number of elements
/ groups: 5 / 5 Focal length: 90.9 mm Entrance pupil: 58.6 mm (related to the first lens surface in light direction) Focusing range: 1 m to Infinity |
| Distance setting | Scale: combined
meter/feet-increments Smallest object field: 220 mm x 330 mm Highest reproduction ratio: 1:9 |
| Diaphragm | Setting / Type:
with clickstops (including half values), manual diaphragm Smallest aperture: f/16 |
| Bayonet | Leica M quick-change bayonet |
| Filter (type) | Internal thread for screw-in type filters E55 |
| Lens hood | Built-in, telescopic |
| Dimensions and weight | Length: 78 mm Largest diameter: 64 mm Weight: approx. 500 g |