![](http://pdfasset.owneriq.net/9/be/9be0747f-cebf-4190-b7fa-4f4294255acb/9be0747f-cebf-4190-b7fa-4f4294255acb-bg6.png)
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
6
0 5 10 15 20
Y'[mm]
0
20
40
60
80
100
[%]
Aperture Stop 4.0
Aperture Stop 4.0
0 5 10 15 20
Y'[mm]
0
20
40
60
80
100
[%]
Aperture Stop 5.6
Aperture Stop 5.6
0 5 10 15 20
Y'[mm]
0
20
40
60
80
100
Aperture Stop 8.0
Aperture Stop 8.0
[%]
0 5 10 15 20
Y'[mm]
0
20
40
60
80
100
[%]
Vignetting
4.0
5.6
8.0
0 5 10 15 20
Y'[mm]
-5
-4
-3
-2
-1
0
1
2
3
4
5
[%]
Relative Distortion
Relative Distortion
0 3 6 9 12 15 18
X'[mm]
0
3
6
9
12
Y'[mm]
Effective Distortion
Effective Distortion
18 mm