Leica Camera Lens 11649 User Manual

LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH.  
1
The LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. features a lens element with two aspherical surfaces, ensuring outstanding opti-  
cal performance across the image plane and at all f-stops. With the lens set to maximum aperture and mounted on a traditional  
Leica M or digital LEICA M8 model, vignetting – an effect which is inherently more prevalent with super wide angle lenses –  
amounts to a nominal 2.3 stops or 1.7 stops on an M8. Stopping down to f/5.6 reduces the vignetting to a value of 1.3 or 1  
respectively. Maximum distortion, in turn, measures only 1.8 percent and is virtually undetectable to the human eye.  
Summary: The LEICA ELMAR-M 18mm f/3.8 ASPH. not only offers optimum image performance, it has compact dimensions - for  
its focal length - and provides all Leica M users with an economical introduction to super wide-angle photography.  
Lens shape  
ASPH.  
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LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH.  
3
MTF graphs  
Aperture Stop 3.8  
Aperture Stop 8.0  
[%]  
[%]  
100  
80  
60  
40  
20  
0
100  
80  
60  
40  
20  
0
0
5
10  
15  
20  
0
5
10  
15  
20  
Y' [mm] = 21.0  
Y' [mm] = 21.0  
Aperture Stop 5.6  
[%]  
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  
_ _ _ _ _ _ _ _  
tangential structures  
0
5
10  
15  
20  
Y' [mm] = 21.0  
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LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH.  
4
Distortion  
Effective Distortion  
Relative Distortion  
[%]  
5
4
Y'[mm]  
3
12  
9
2
1
0
-1  
-2  
-3  
-4  
-5  
6
3
0
0
3
6
9
12 15 18  
X'[mm]  
0
5
10  
15  
20  
Y' [mm] = 21.0  
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.  
100  
8.0  
5.6  
3.8  
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  
Y' [mm] = 21.0  
20  
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LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH.  
5
Depth of field table  
Aperture Stop  
Magnification  
3,8  
5,6  
8
11  
16  
0,7  
0,8  
1
0,575 - 0,904  
0,638 - 1,087  
0,754 - 1,516  
0,857 - 2,058  
0,993 - 3,204  
1,181 - 7,235  
1,455 - ∞  
0,532 - 1,054  
0,584 - 1,317  
0,677 - 2,026  
0,758 - 3,160  
0,860 - 7,187  
0,994 - ∞  
0,484 - 1,361  
0,526 - 1,851  
0,598 - 3,741  
0,658 - 11,73  
0,732 - ∞  
0,436 - 2,178  
0,469 - 3,879  
0,523 - ∞  
0,568 - ∞  
0,620 - ∞  
0,682 - ∞  
0,759 - ∞  
0,834 - ∞  
0,979 - ∞  
0,377 - ∞  
0,399 - ∞  
0,436 - ∞  
0,465 - ∞  
0,498 - ∞  
0,535 - ∞  
0,579 - ∞  
0,619 - ∞  
0,691 - ∞  
1/34,5  
1/39,9  
1/50,9  
1/61,8  
1/78,2  
1/106  
1/160  
1/270  
1/∞  
1,2  
1,5  
2
0,824 - ∞  
3
1,177 - ∞  
0,943 - ∞  
5
1,788 - ∞  
1,381 - ∞  
1,065 - ∞  
2,721 - ∞  
1,866 - ∞  
1,324 - ∞  
Aperture Stop 3,8  
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]  
Aperture Stop 5,6  
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]  
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LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH.  
7
Aperture Stop 8  
0,7  
0,8  
1
1,2  
1,5  
2
3
5
0
0
0
1
1
1
2
2
2
3
3
3
4
5
6
6
6
7
7
7
8
8
8
9
9
9
10  
10  
10  
Depth of Field [m]  
Aperture Stop 11  
0,7  
0,8  
1
1,2  
1,5  
2
3
5
4
5
Depth of Field [m]  
Aperture Stop 16  
0,7  
0,8  
1
1,2  
1,5  
2
3
5
4
5
Depth of Field [m]  
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