 |
APO-SUMMICRON-R 90 mm f/2 ASPH.
|
Apochromatic correction and the use of a lens element with an aspherical surface are combined in this compact telephoto lens for high-performance imaging. Two of the five lens elements are made of high-refraction optical glass. Two other lens elements have anomalous partial dispersion. As a result, brilliance and resolution are exemplary, even at full aperture. Peak performance is achieved at full aperture. Vignetting is already minimal with the lens wide open. As a result of the large aperture of f/2 and impressive contrast rendition, it produces a particularly bright viewfinder image that permits very accurate and positive focusing, even in poor light. The nearest focusing distance is 0.7 m (27.5 in), so that subjects as small as 14 x 21 cm (5.5 x 8.25 in) can be explored. Combining this lens with the LEICA APO-EXTENDER-R 2 x produces a high-performance tele combination of 180 mm f/4. |
| 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: 0.7 m to Infinity |
| Distance setting | Scale: Combined
meter/feet-increments Smallest object field: 140 mm x 210 mm Highest reproduction ratio: 1:5.8 |
| Diaphragm | Setting / Type:
Preset diaphragm with clickstops (including half values), Fully automatic
diaphragm Smallest aperture: f/16 |
| Bayonet | LEICA R quick-change bayonet for LEICA R3 to LEICA R9 with mechanical, and, for LEICA R8/R9, additional electronic exposure control |
| Filter (type) | Internal thread for screw-in type filters E 60 |
| Lens hood | Built-in, telescopic, lockable |
| Dimensions and weight | Length: 59 mm Largest diameter: 70 mm Weight: approx. 520 g |