Leica Camera Lens 11648 User Manual

LEICA ELMAR-M 24 mm f/3.8 ASPH.  
1
The LEICA ELMAR-M 24mm f/3.8 ASPH. is an extremely compact lens, especially for such a wide angle, which also offers out-  
standing imaging performance. Even with at full stop, it delivers uniformly excellent reproduction quality over the entire image  
field, only deteriorating slightly towards the edges in the close-up range. This performance can only be improved slightly by stop-  
ping down, which means that you can take photographs with at full stop without concerns, unless your compositional ideas call  
for a greater depth of field that can only be achieved with smaller apertures. The vignetting characteristic of every optical system  
is naturally more pronounced on a super wide angle lens than on normal and long focal length lenses. With the diaphragm com-  
pletely open, it is a maximum - i.e. in the corners of the image - of around 1.9 stops for the 35mm format, or around 1.1 stops on  
Leica M8 models with their slightly smaller format. Stopping down to 5.6 visibly reduces this light falloff at the image edges - to  
1.4 and 0.8 stops respectively. Stopping down further does not bring about any notable reduction since essentially only the natu-  
ral vignetting remains. The lens' maximum distortion is around 1% and therefore hardly perceptible.The retrofocus-like construc-  
tion is made up of a total of eight lens elements and the use of an aspherical surface and glass types with anomalous color  
dispersion (partial dispersion) make a crucial contribution towards restricting aberrations to an absolute minimum.  
Summary: The LEICA ELMAR-M 24mm f/3.8 ASPH. not only offers optimum imaging performance but also - for its focal length -  
compact dimensions and also provides all Leica M users with an affordable introduction to the world of super wide angle photo-  
graphy.  
ASPH.  
Lens shape  
 
LEICA ELMAR-M 24 mm f/3.8 ASPH.  
3
MTF graphs  
Aperture Stop 8.0  
Aperture Stop 3.8  
[%]  
[%]  
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  
[%]  
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.  
100  
80  
60  
40  
20  
0
sagittal structures  
_ _ _ _ _ _ _ _  
tangential structures  
0
5
10  
15  
20  
Y' [mm] = 21.0  
 
LEICA ELMAR-M 24 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  
[%]  
100  
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.  
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  
 
LEICA ELMAR-M 24 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
0,623 - 0,802  
0,699 - 0,939  
0,843 - 1,234  
0,978 - 1,563  
1,163 - 2,129  
1,436 - 3,338  
1,876 - 7,731  
2,484 - ∞  
0,592 - 0,862  
0,660 - 1,024  
0,786 - 1,391  
0,900 - 1,829  
1,053 - 2,667  
1,269 - 4,926  
1,596 - 32,20  
2,012 - ∞  
0,556 - 0,959  
0,615 - 1,167  
0,721 - 1,679  
0,814 - 2,37  
0,936 - 4,047  
1,100 - 13,73  
1,335 - ∞  
0,517 - 1,118  
0,567 - 1,419  
0,654 - 2,277  
0,729 - 3,815  
0,823 - 11,77  
0,946 - ∞  
0,465 - 1,560  
0,503 - 2,242  
0,569 - 5,781  
0,623 - ∞  
1/25,6  
1/29,7  
1/37,9  
1/46  
1,2  
1,5  
2
0,688 - ∞  
1/58,3  
1/78,7  
1/120  
1/201  
1/∞  
0,769 - ∞  
3
1,110 - ∞  
0,872 - ∞  
5
1,608 - ∞  
1,290 - ∞  
0,975 - ∞  
4,838 - ∞  
3,298 - ∞  
2,324 - ∞  
1,704 - ∞  
1,188 - ∞  
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]  
 
LEICA ELMAR-M 24 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]  
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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