LEICA SUMMARIT-M 90 mm f/2.5
1
The LEICA SUMMARIT-M 90 mm f/2.5 is a versatile telephoto lens that rounds off the new lens speed class of Summarit-M len-
ses. Despite being much more handy and lighter than the comparable 90 mm Summicron lens, it offers outstanding optical and
mechanical quality. Even at full aperture, this lens demonstrates excellent imaging capability with outstanding contrast over the
entire image field. A slight reduction in quality can only be seen in the corners - which are not even captured by the slightly smal-
ler format of the digital LEICA M8 - but even this can be improved significantly by stopping down to f/5.6.
Lens shape
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LEICA SUMMARIT-M 90 mm f/2.5
3
MTF graphs
Aperture Stop 5.6
Aperture Stop 2.5
[%]
[%]
100
80
60
40
20
0
100
80
60
40
20
0
0
5
10
15
20
0
5
10
15
20
Y' [mm] = 21.0000
Y' [mm] = 21.0000
Aperture Stop 4.0
[%]
100
80
60
40
20
0
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.
sagittal structures
_ _ _ _ _ _ _ _
0
5
10
15
20
tangential structures
Y' [mm] = 21.0000
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LEICA SUMMARIT-M 90 mm f/2.5
4
Distortion
Relative Distortion
Effective Distortion
[%]
5
4
Y'[mm]
3
12
9
2
1
0
-1
-2
-3
-4
-5
6
3
0
0
0
5
10
15
20
3
6
9
12 15 18
X'[mm]
Y' [mm] = 21.0000
Vignetting
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
[%]
100
5.6
4.0
2.5
80
60
40
20
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.
0
0
5
10
15
20
Y' [mm] = 21.0000
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LEICA SUMMARIT-M 90 mm f/2.5
5
Depth of field table
Aperture Stop
Magnification
2,5
2,8
4
5,6
8
11
16
1
1,2
1,5
2
0,991 - 1,009
1,186 - 1,214
1,479 - 1,522
1,962 - 2,040
2,913 - 3,092
4,762 - 5,263
9,087 - 11,12
98,79 - ∞
0,990 - 1,010
1,185 - 1,215
1,477 - 1,524
1,958 - 2,044
2,905 - 3,102
4,739 - 5,292
8,999 - 11,250
89,21 - ∞
0,986 - 1,015
1,179 - 1,222
1,467 - 1,535
1,941 - 2,063
2,866 - 3,147
4,636 - 5,427
8,632 - 11,89
62,61 - ∞
0,980 - 1,021
1,171 - 1,231
1,454 - 1,549
1,918 - 2,090
2,816 - 3,210
4,505 - 5,619
8,186 - 12,85
44,79 - ∞
0,972 - 1,030
1,159 - 1,244
1,435 - 1,571
1,885 - 2,131
2,745 - 3,309
4,322 - 5,933
7,597 - 14,64
31,39 - ∞
0,962 - 1,042
1,144 - 1,262
1,412 - 1,600
1,845 - 2,184
2,660 - 3,442
4,113 - 6,380
6,971 - 17,73
22,85 - ∞
0,945 - 1,062
1,121 - 1,292
1,376 - 1,649
1,782 - 2,280
2,530 - 3,689
3,807 - 7,297
6,130 - 27,35
15,72 - ∞
1/8,9
1/11,1
1/14,4
1/20,0
1/31,0
1/53,0
1/108
1/∞
3
5
10
∞
Aperture Stop 2,5
1
1,2
1,5
2
3
5
10
∞
0
5
10
15
20
25
30
35
40
45
50
Depth of Field [m]
Aperture Stop 2,8
1
1,2
1,5
2
3
5
10
∞
0
5
10
15
20
25
30
35
40
45
50
Depth of Field [m]
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LEICA SUMMARIT-M 90 mm f/2.5
6
Aperture Stop 4
1
1,2
1,5
2
3
5
10
∞
0
0
0
5
5
5
10
10
10
15
15
15
20
25
30
30
30
35
35
35
40
40
40
45
45
45
50
50
50
Depth of Field [m]
Aperture Stop 5,6
1
1,2
1,5
2
3
5
10
∞
20
25
Depth of Field [m]
Aperture Stop 8
1
1,2
1,5
2
3
5
10
∞
20
25
Depth of Field [m]
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LEICA SUMMARIT-M 90 mm f/2.5
7
Aperture Stop 11
1
1,2
1,5
2
3
5
10
∞
0
5
10
15
20
25
30
35
40
45
50
Depth of Field [m]
Aperture Stop 16
1
1,2
1,5
2
3
5
10
∞
0
5
10
15
20
25
30
35
40
45
50
Depth of Field [m]
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