Leica Camera Lens 11646 User Manual

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  
 
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  
 
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  
 
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]  
 
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]  
 
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]  
Leica Camera AG / Oskar-Barnack-Straße 11 / D-35606 Solms / Telefon +49 (0) 6442-208-0 / Telefax +49 (0) 6442-208-333  
 

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