Leica Summicron-M 35mm f/2 ASPH User manual

LEICA SUMMICRON-M 35 mm f/2 ASPH. 1
Excellent sharpness, high contrast and a superb resolving power over the entire focusing range are evident at full aperture. With its
aperture stopped down modestly to f/4, this versatile lens delivers a maximum of resolving power and contrast. It is all the more
impressive because of its virtually perfect absence of distortion. That makes it a world-class lens among fast wide-angle lenses. In
spite of its high speed and its superb imaging performance, it is surprisingly small. Every Leica M camera fitted with this lens beco-
mes a highly compact and elegant unit.
Lens shape
Asphere

LEICA SUMMICRON-M 35 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
63°, 54°, 38°
Number of elements / groups: 7 / 5
Focal length: 35.3 mm
Entrance pupil: 10 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: 419 mm x 627 mm
Highest reproduction ratio: 1:17.5
Setting / Type: with clickstops (including half values), manual diaphragm
Smallest aperture: f/16
Leica M quick-change bayonet
internal thread for screw-in type filters E 39
separate, clip-on type
Length: 34.5 mm
Largest diameter: 53 mm
Weight: approx. 255 g / 340 g (black anodized- / silver chrome finish)

LEICA SUMMICRON-M 35 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
MTF graphs
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
_ _ _ _ _ _ _ _

LEICA SUMMICRON-M 35 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 SUMMICRON-M 35 mm f/2 ASPH. 5
Depth of field table
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                      
                      
                      
                      
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                      
                      
                      
                      
                      
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LEICA SUMMICRON-M 35 mm f/2 ASPH. 6
!"#"!
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LEICA SUMMICRON-M 35 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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