Leica Camera Lens 11141 User Manual

LEICA APO-SUMMICRON-M 50 mm f/2 ASPH.  
LIAA
1
More than 30 years after the launch of Summicron-M 1:2/50 mm, which is still available, the Leica APO Summicron-M  
1:2/50 mm ASPH. represents a totally new development. With its compact body - only marginally longer and slightly heavier than  
the Summicron-M 1:2/50 mm, and with an almost identical diameter, it provides visibly higher image quality. On the Leica APO  
Summicron-M 1:2/50 mm ASPH. the exceptional correction enables all aberrations to be reduced to a minimum level that is negli-  
gible in digital photography. Its key features include excellent contrast rendition, all the way to the corners of the image, even with  
a fully open aperture. The use of a „floating element“ ensures that this is retained, even for close-up shots. Vignetting is limited to  
a maximum - i.e. in the corners of the image - of just 2 stops at full aperture in 35 mm format, or around 1 on the Leica M8 mo-  
dels. Stopping down to 2.8 visibly reduces this light deterioration towards the edge of the image, with practically only the natural  
vignetting remaining. Distortion is very low at a maximum of just 0.4 % (pin cushoin), which is practically imperceptible. A total of  
eight lens elements are used to achieve this exceptional performance. To realize the apochromatic correction (resulting in a com-  
mon focusing plane for three light wavelengths), three are made of glass types with high anomalous partial color dispersion, while  
two of the others have a high refractive index. The aspherical surface of the first lens in the rear group helps to reduce spherical  
aberration and flatten the image field. While the optical construction in front of the aperture is a Gaussian type, the arrangement  
of the lens elements behind it is similar to that in the Summilux-M 1:1.4/35 mm ASPH. This group comprises a „floating element“,  
which is moved independently of the rest of the construction during focusing.  
Summary: The Leica APO Summicron-M 1:2/50 mm ASPH. delivers exceptional picture quality and sets new standards in 35 mm  
digital photography.  
Optical design  
Aspherical surface  
Floating Element  
 
LEICA APO-SUMMICRON-M 50 mm f/2 ASPH.  
LEICA SUPER ELMAR-M 21mm f/3.4 ASPH.  
3
MTF-graphs  
f/2.0  
Aperture Stof/p25.8.6  
[%]  
[%]  
100  
100  
80  
60  
40  
20  
0
1
80  
60  
40  
20  
0
0
3
6
9
12 15 18 21  
Y'[mm]  
0
3
6
9
12 15 18 21  
Y' [mm]  
f/5.6  
[%]  
100  
80  
60  
40  
20  
0
The MTF is indicated at full aperture, at f/2,8 and 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  
0
3
6
9
12 15 18 21  
Y'[mm]  
 
LEICA APO-SUMMICRON-M 50 mm f/2 ASPH.  
LEICA SUPER ELMAR-M 21mm f/3.4 ASPH.  
4
Distortion  
Relative Distortion  
Effective Distortion  
[%]  
5
Y'[mm]  
12  
4
3
2
1
9
6
3
0
0
-1  
-2  
-3  
-4  
-5  
0
3
6
9
12 15 18 21  
Y'[mm]  
0
3
6
9
12 15 18  
X'[mm]  
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 magnifica-  
tion. The image height of 21.6 mm is the radial distance  
between the edge and the middle of the image field for  
the 24 mm x 36 mm format. The graph of the effective  
distortion illustrates the appearance of straight horizon-  
tal and vertical lines in the picture.  
100  
f/5.6  
80  
60  
40  
20  
f/2.8  
f/2.0  
Vignetting is a continous decrease of the illumination to-  
wards the edges of the image field. The graph shows the  
percentage lost of illumination over the image height.  
100% means no vignetting.  
0
0
3
6
9
12 15 18 21  
Y'[mm]  
 
LEICA APO-SUMMICRON-M 50 mm f/2 ASPH.  
LEICA SUPER ELMAR-M 21mm f/3.4 ASPH.  
5
Depth of field table  
Blende  
Aperture Stop  
Magnificationgn  
Vergrößeru  
2,0  
2,8  
4,0  
5,6  
8,0  
11,0  
16,0  
0,7  
0,8  
1
0,690 - 0,710 0,686 - 0,714 0,681 - 0,721 0,673 - 0,729 0,662 - 0,743 0,649 - 0,760 0,629 - 0,792  
0,787 - 0,814 0,782 - 0,819 0,774 - 0,828 0,764 - 0,840 0,750 - 0,858 0,733 - 0,882 0,706 - 0,926  
0,979 - 1,023 0,971 - 1,032 0,958 - 1,046 0,943 - 1,065 0,920 - 1,096 0,894 - 1,137 0,853 - 1,214  
1,169 - 1,233 1,157 - 1,247 1,139 - 1,268 1,117 - 1,297 1,085 - 1,345 1,047 - 1,409 0,991 - 1,531  
1,450 - 1,554 1,432 - 1,575 1,404 - 1,610 1,370 - 1,659 1,321 - 1,739 1,264 - 1,850 1,181 - 2,071  
1,910 - 2,099 1,878 - 2,139 1,830 - 2,205 1,771 - 2,300 1,688 - 2,459 1,595 - 2,693 1,462 - 3,203  
2,799 - 3,233 2,729 - 3,332 2,627 - 3,499 2,503 - 3,749 2,338 - 4,201 2,161 - 4,950 1,919 - 7,055  
4,458 - 5,694 4,280 - 6,016 4,032 - 6,591 3,743 - 7,556 3,381 - 9,690 3,017 - 15,01 2,560 - 185,1  
1/11,3  
1/13,2  
1/17,1  
1/21  
1,2  
1,5  
2
1/26,8  
1/36,5  
1/55,8  
1/94,5  
1/∞  
3
5
40,20 -  
29,05 -  
20,36 -  
14,55 -  
10,20 -  
7,435 -  
5,128 -  
Aperture Stop 2,0  
0.7  
0.8  
1
1.2  
1.5  
2
3
5
0
1
2
3
4
5
6
Depth of Field [m]  
AAppeertruturereSStotopp22,8.8  
0.7  
0.8  
1
1.2  
1.5  
2
3
5
0
1
2
3
4
5
6
Depth of Field [m]  
 
LEICA SUPER ELMAR-M 21mm f/3.4 ASPH.  
LEICA APO-SUMMICRON-M 50 mm f/2 ASPH.  
6
Aperture Stop 4,0  
B
0,7  
0,8  
1
1,2  
1,5  
2
3
5
0
1
2
3
4
5
6
7
Depth of Field [m]  
Aperture Stop 5,6  
Blende 5,6  
0,7  
0,8  
1
1,2  
1,5  
2
3
5
0
1
2
3
4
5
6
7
8
Depth of Field [m]  
Schäfeniefe [m]  
 
LEICA APO-SUMMICRON-M 50 mm f/2 ASPH.  
7
Aperture Stop 8,0  
0,7  
0,8  
1
1,2  
1,5  
2
3
5
0
1
2
3
4
5
6
7
8
9
10  
Depth of Field [m]  
crfnif
Aperture Stop 11,0  
Blende 11,0  
0,7  
0,8  
1
1,2  
1,5  
2
3
5
0
1
2
3
4
5
6
7
8
9
10  
Depth of Field [m]  
Schärfentiefe [m]  
 
LEICA APO-SUMMICRON-M 50 mm f/2 ASPH.  
8
Aperture Stop 16,0  
0,7  
0,8  
1
1,2  
1,5  
2
3
5
0
1
2
3
4
5
6
7
8
9
10  
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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