LEICA SUMMICRON-M 35 mm f/2 ASPH.
Technical Data.
Illustrations 1:1
Lens
Leica Summicron-M 35 mm f/2 ASPH.
Order number
Black: 11 673, silver: 11 674
Angle view
(diagonal, horizontal, vertical)
For 35 mm (24 x 36 mm): approx. 63°/54°/38°;
for M8 (18 x 27 mm): approx. 50°/42°/29°
Optical design
Number of elements/groups: 7/5
Entrance pupil for bayonet: 18,4 mm
Focusing range: 0,7 m to infinity
Distance setting
Scala: combined meter-/feet-increments
Smallest object field: for 35 mm: 420 x 630 mm, for M8: 315 x 472 mm
Highest reproduction ratio: 1:17,4
Diaphragm
Setting/type: preset, with click-stops, half values available
Smallest aperture: f/16
Number of aperture blades: 11
Bayonet
Leica M quick-change bayonet
Filter thread
E39
Lens hood
Available, screwable (supplied)
Dimensions and weight
Lenght: approx. 35,7/54,4 mm (without/with lens hood)
Largest diameter without lens hood: approx. 53 mm
Weight: approx. 252 g/287 g (without/with lens hood and covers)
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LEICA SUMMICRON-M 35 mm f/2 ASPH.
ENGINEERING DRAWING
LENS SHAPE
Aspherical lens
Illustrations 1:1
Excellent sharpness, high contrast and a very good 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 becomes a highly compact and elegant unit.
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LEICA SUMMICRON-M 35 mm f/2 ASPH.
3
LEICA SUMMICRON-M 35 mm f/2 ASPH.
MTF-GRAPHS
MTF graphs
Aperture Stop 2.0
[%]
100
Aperture Stop 5.6
[%]
100
80
80
60
60
40
40
20
20
0
0
0
5
10
15
20
Y' [mm]
0
5
10
15
20
Y' [mm]
Aperture Stop 2.8
[%]
100
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.
80
60
40
20
Sagittal structures
sagittal structures
_ _ _ _ _ _ _ _ tangential
structures
Tangential
structures
0
0
5
10
15
20
Y' [mm]
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.
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LEICA SUMMICRON-M 35 mm f/2 ASPH.
4
LEICA SUMMICRON-M 35 mm f/2 ASPH.
Distortion
Distortion
Distortion
[%]
5
4[%]
5
3
4
2
3
1
2
0
1
-1
0
-2
-1
-3
-2
-4
-3
-5
-4 0
-5
0
Effective Distortion
Relative Distortion
Relative Distortion
Y' [mm]
12
12
9
9
6
6
3
3
0
5
5
10
15
10
Y' [mm]
15
20
0
20
3
6
9
12
15
12
X' [mm]
15 18
0
0
3
6
9
18
X' [mm]
Y' [mm]
VIGNETTING
Effective Distortion
Y' [mm]
Vignetting
Vignetting
[%]
100
[%]
100
80
5.6
2.8
2.0
5.6
2.8
2.0
80
60
60
40
40
20
20
0
0
5
10
0
5
10
0
15
20
Y' [mm]
15
20
Y' [mm]
Distortion is the deviation of the real image height
(in the picture) from the ideal image height. The
relative
distortion
is the percentage
Distortion
is the deviation
of the realdeviation.
image height
The
ideal
image from
height
from the
object
(in the
picture)
theresults
ideal image
height.
The
height
the magnification.
The image
height of
relativeand
distortion
is the percentage
deviation.
21.6mm
the radial
distance
edge and
The idealisimage
height
results between
from thethe
object
the
middle
image field for
format
24mm
height
and of
thethe
magnification.
Thethe
image
height
of x
36mm.
graph
of the
effective
distortion
illustra21.6mmThe
is the
radial
distance
between
the edge
and
tes
appearance
of straight
horizontal
and24mm
verti- x
the the
middle
of the image
field for
the format
cal
linesThe
in the
picture.
36mm.
graph
of the effective distortion illustrates the appearance of straight horizontal and vertiVignetting
a continous
cal lines inisthe
picture. decrease of the illumination to the edges of the image field. The graph
shows
the percentage
lostdecrease
of
illumination
the
Sagittal
structures
Vignetting
is a continous
of the over
illuminaimage
100%
no vignetting.
tion toheight.
the edges
of means
the image
field. The graph
Tangential
shows the percentage
lost of structures
illumination over the
sagittal
structures
image height. 100%
means
no vignetting.
_ _ _ _ _ _ _ _ tangential structures
sagittal structures
_ _ _ _ _ _ _ _ tangential structures
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 21.6 mm is the radial distance
between the edge and the middle of the image field for the format 24 mm x 36 mm. The graph of the effective distortion illustrates the
appearance of straight horizontal and vertical lines in the picture.
VIGNETTING
Vignetting is a continous decrease of the illumination to the edges of the image field. The graph shows the percentage loss of illumination
over the image height. 100% means no vignetting.
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LEICA SUMMICRON-M 35 mm f/2 ASPH.
Depth of field table
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LEICA SUMMICRON-M 35 mm f/2 ASPH.
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LEICA SUMMICRON-M 35 mm f/2 ASPH.
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