Leica Apo-Summicron-R 90 f/2 ASPH User manual

LEICA APO-SUMMICRON-R 90 mm f/2 ASPH. 1
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 achie-
ved 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. Com-
bining this lens with the LEICA APO-EXTENDER-R 2 x produces a high-performance tele combination of 180 mm f/4.
Lens shape
Asphere

LEICA APO-SUMMICRON-R 90 mm f/2 ASPH. 2
Engineering drawing
Technical Data
Angle of view (diagonal, horizontal, vertical)
Optical design
Distance setting
Diaphragm
Bayonet
Filter (type)
Lens hood
Dimensions and weight
27°, 22°, 15°
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
Scale: Combined meter/feet-increments
Smallest object field: 140 mm x 210 mm
Highest reproduction ratio: 1:5.8
Setting / Type: Preset diaphragm with clickstops (including half values), Fully automatic diaphragm
Smallest aperture: f/16
LEICA R quick-change bayonet for LEICA R3 to LEICA R9with mechanical, and, for LEICA R8/R9,
additional electronic exposure control
Internal thread for screw-in type filters E 60
Built-in, telescopic, lockable
Length: 59 mm
Largest diameter: 70 mm
Weight: approx. 520 g

LEICA APO-SUMMICRON-R 90 mm f/2 ASPH. 3
0 5 10 15 20
Y'[mm]
0
20
40
60
80
100[%] Aperture Stop 2.0
0 5 10 15 20
Y'[mm]
0
20
40
60
80
100
Aperture Stop 5.6
[%]
0 5 10 15 20
Y'[mm]
0
20
40
60
80
100[%] Aperture Stop 2.8
The MTF is indicated both at full aperture and at
f/5.6 at long taking distances (infinity). Shown
is the contrast in percentage for 5, 10, 20 and
40 lp/mm accross the height of the 35 mm film
format, for tangential (dotted line) and sagittal
(solid line) structures, in white light. The 5 and
10 lp/mm will give an indication regarding the
contrast ratio for large object structures.The
20 and 40 lp/mm records the resolution of finer
and finest object structures.
tangential structures
sagittal structures
_ _ _ _ _ _ _ _
MTF graphs

LEICA APO-SUMMICRON-R 90 mm f/2 ASPH. 4
Distortion
Vignetting
0 5 10 15 20
Y'[mm]
-5
-4
-3
-2
-1
0
1
2
3
4
5[%]
Relative Distortion
0 5 10 15 20
Y'[mm]
0
20
40
60
80
100[%]
2.0
2.8
5.6
0 3 6 9 12 15 18
X'[mm]
0
3
6
9
12
Y'[mm]
Effective Distortion
Distortion is the deviation of the real image height
(in the picture) from the ideal image height. The
relative distortion is the percentage deviation.
The ideal image height results from the object
height and the magnification. The image height of
21.6mm is the radial distance between the edge and
the middle of the image field for the format 24mm x
36mm. The graph of the effective distortion illustra-
tes the appearance of straight horizontal and verti-
cal lines in the picture.
Vignetting is a continous decrease of the illumina-
tion to the edges of the image field. The graph
shows the percentage lost of illumination over the
image height. 100% means no vignetting.
tangential structures
sagittal structures
_ _ _ _ _ _ _ _

LEICA APO-SUMMICRON-R 90 mm f/2 ASPH. 5
Depth of field table
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                      
                      
                      
                      
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LEICA APO-SUMMICRON-R 90 mm f/2 ASPH. 6
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LEICA APO-SUMMICRON-R 90 mm f/2 ASPH. 7
Leica Camera AG / Oskar-Barnack-Straße 11 / D-35606 Solms / Telefon [phone] / Telefax + 49 (0) 6442-208-333
www.leica-camera.com / [e-mail]
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