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3.3 Spatial frequency-contrast characteristic
Frequency, lines/mm Contrast transfer
coefficient
2.5 0.83
7.5 0.56
15.0 0.30
3.4 Field of view cleanness
Allowed spot
diameter, m
I ZONE
0 - 5, 6
mm
II ZONE
5, 6 - 14,7
mm
III ZONE
14,7 - 17, 5
mm
Over 250 0 0 0
150 to 250 0 0 1
100 to 150 0 2 2
50 to 100 1 3 3
0 to 50 Not specified