LEICA APO-SUMMICRON-R 90 mm f/2 ASPH

LEICA 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 chieved 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.
LEICA APO-SUMMICRON-R 90 mm f/2 ASPH Technical Data
Angle of view (diagonal, horizontal, vertical) 27°, 22°, 15°
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
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