Leica 11646 manual 21.0000

LEICA SUMMARIT-M 90 mm f/2.5 4

Distortion

	[%]		Relative Distortion					Effective Distortion
5
						Y'[mm]
4
3						12
2
1						9
0
-1						6
-2
-3						3
-4
-5						0
0		5	10	15	20	0	3	6	9	12	15	18
				Y' [mm] =	21.0000							X'[mm]

Vignetting
		Distortion is the deviation of the real image height
	Vignetting	(in the picture) from the ideal image height. The
100[%]		relative distortion is the percentage deviation.
		The ideal image height results from the object
		height and the magnification. The image height of
80	5.6	21.6mm is the radial distance between the edge and
	4.0	the middle of the image field for the format 24mm x

2.536mm. The graph of the effective distortion illustra-

60				tes the appearance of straight horizontal and verti-
				cal lines in the picture.
40				Vignetting is a continous decrease of the illumina-
				tion to the edges of the image field. The graph
20				shows the percentage loss of illumination over the
				image height. 100% means no vignetting.
0
0	5	10	15	20
			Y' [mm] =	21.0000