8
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
