Specification

LEICA APO-SUMMICRON-M 75 mm f/2 ASPH.
5
Distortion
Vignetting
0 5 10 15 20
Y'[mm]
-5
-4
-3
-2
-1
0
1
2
3
4
5
[%]
Relative Distortion
0 5 10 15 20
Y'[mm]
0
20
40
60
80
100
[%]
gg
2.0
2.8
5.6
0 3 6 9 12 15 18
X'[mm]
0
3
6
9
12
Y'[mm]
Effective Distortion
Distortion is the deviation of the real image height(in
the picture) from the ideal image height. Therelative
distortion is the percentage deviation.The ideal
image height results from the objectheight and the
magnification. The image height of21.6mm is the
radial distance between the edge andthe middle of
the image field for the format 24mm x36mm. The
graph of the effective distortion illustra-tes the
appearance of straight horizontal and verti-cal lines
in the picture.
Vignetting is a continous decrease of the illumina-
tion to the edges of the image field. The graphshows
the percentage lost of illumination over theimage
height. 100% means no vignetting.