LEICA APO-SUMMICRON-R 90 mm f/2 ASPH(E55).
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.
• Construction 5 Groups /5 Elements
• Angle of view 27°
• F stop range 2-16
• Closest Focusing Distance 3.3'
• Maximum Magnification 1:9
• Filter Size E 55
• Dimensions (Length x Diameter) 3.1 x 2.5'' 78 x 64mm
• Weight 1.10 lb 500g