Leica SUMMARIT-M 75 mm f/2.5 User manual

LEICA SUMMARIT-M 75 mm f/2.5 1
The LEICA SUMMARIT-M 1:2.5/75 mm is a new "short telephoto" lens that is significantly smaller and lighter than Summicron
lenses with the same focal length, but still offers the image quality that is the hallmark of Leica M lenses. Combined with the 35
mm Summarit-M, it makes up an ideal shooting outfit with a useful lens speed that opens up fascinating composition options for
Leica M photographers. The new 75 mm Summarit-M replaces the portrait focal lengths of 90 -100 mm for digital use. Its excep-
tionally compact design and performance bring a new level of flexibility to rangefinder photography.
Lens shape

LEICA SUMMARIT-M 75 mm f/2.5 2
Technical Data
Angle of view(diagonal, horizontal, vertical)
Optical design
Distance setting
Aperture
Bayonet
Filter mount/Lens hood
Dimensions and weight
For 35 mm (24 x 36 mm) : 32°, 27°, 18°, for LEICA M8 (18 x 27 mm) : 24.4°, 20.4°, 13.7°,
corresponds to a focal length of approx. 100 mm with 35 mm-format
Number of lenses/groups: 6 / 4
Focal length: 75.0 mm
Position of entrance pupil: 29.9 mm (related to the first lens surface in light direction)
Focusing range: 0.9 to endless
Scales: Combined meter/feet graduation
Smallest object field/Largest reproduction ratio:
For 35 mm, approx. 238 x 357 mm /1:9.9;
for LEICA M8, approx. 178 x 268 mm /1:9.9
Setting/Function: Preset, with click-stops, half values available
Lowest value: 16
Leica M quick-change bayonet with 6 bit lens identification bar code for digital M models
Non-rotating, internal thread for screw-on filters size E46, external thread with stop for lens hood,
protection ring for external thread included in delivery, lens hood available as accessory
Length: approx. 60.5 mm
Largest diameter: approx. 55 mm
Weight: approx. 345 g
Engineering drawing

LEICA SUMMARIT-M 75 mm f/2.5 3
0 5 10 15 20
Y' [mm] = 21.0000
0
20
40
60
80
100[%] Aperture Stop 2.5
0 5 10 15 20
Y' [mm] = 21.0000
0
20
40
60
80
100
Aperture Stop 5.6
[%]
0 5 10 15 20
Y' [mm] = 21.0000
0
20
40
60
80
100[%] Aperture Stop 4.0
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 SUMMARIT-M 75 mm f/2.5 4
Distortion
Vignetting
0 5 10 15 20
Y' [mm] = 21.0000
-5
-4
-3
-2
-1
0
1
2
3
4
5[%] Relative Distortion
0 5 10 15 20
0
20
40
60
80
100[%] Vignetting
2.5
4.0
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 loss of illumination over the
image height. 100% means no vignetting.

LEICA SUMMARIT-M 75 mm f/2.5 5
Depth of field table
Magnification
0,9 0,890 - 0,910 0,889 - 0,912 0,884 - 0,917 0,877 - 0,924 0,868 - 0,934 0,857 - 0,948 0,839 - 0,972 1/9,92
1 0,987 - 1,013 0,986 - 1,015 0,980 - 1,021 0,972 - 1,030 0,960 - 1,043 0,946 - 1,061 0,924 - 1,091 1/11,3
1,2 1,181 - 1,219 1,179 - 1,222 1,170 - 1,231 1,159 - 1,245 1,142 - 1,265 1,122 - 1,291 1,089 - 1,337 1/13,9
1,5 1,470 - 1,531 1,467 - 1,535 1,453 - 1,551 1,435 - 1,572 1,408 - 1,605 1,377 - 1,648 1,328 - 1,726 1/18,0
2 1,946 - 2,057 1,940 - 2,064 1,915 - 2,093 1,883 - 2,133 1,837 - 2,195 1,783 - 2,279 1,700 - 2,434 1/24,6
3 2,878 - 3,133 2,864 - 3,150 2,809 - 3,219 2,740 - 3,316 2,642 - 3,473 2,530 - 3,691 2,362 - 4,126 1/38,0
8 7,171 - 9,048 7,079 - 9,198 6,749 - 9,825 6,354 - 10,81 5,840 - 12,73 5,306 - 16,37 4,604 - 31,36 1/105
∞ 68,25 - ∞ 60,68 - ∞ 42,59 - ∞ 30,46 - ∞ 21,34 - ∞ 15,54 - ∞ 10,70 - ∞ 1/∞
Distance Setting [m]
perture Stop
5,6 8 11 162,5 2,8 4
perture Stop 2,5
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
∞
8
3
2
1,5
1,2
1
0,9
Distance Setting [m]
Depth of Field [m]
perture Stop 2,8
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
∞
8
3
2
1,5
1,2
1
0,9
Distance Setting [m]
Depth of Field [m]

LEICA SUMMARIT-M 75 mm f/2.5 6
perture Stop 8
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
∞
8
3
2
1,5
1,2
1
0,9
Distance Setting [m]
Depth of Field [m]
perture Stop 4
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
∞
8
3
2
1,5
1,2
1
0,9
Distance Setting [m]
Depth of Field [m]
perture Stop 5,6
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
∞
8
3
2
1,5
1,2
1
0,9
Distance Setting [m]
Depth of Field [m]

LEICA SUMMARIT-M 75 mm f/2.5 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]
perture Stop 11
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
∞
8
3
2
1,5
1,2
1
0,9
Distance Setting [m]
Depth of Field [m]
perture Stop 16
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
∞
8
3
2
1,5
1,2
1
0,9
Distance Setting [m]
Depth of Field [m]