USAF pattern is printed in black, red, yellow, and blue to test for chromatic aberration and at 90° for testing astigmatism.
產品
Technical Information
Number of Line Pairs / mm in USAF Resolving Power Test Target 1951
Element
Group No.
-2
-1
0
1
2
3
1
0.250
0.500
1.00
2.00
4.00
8.00
2
0.280
0.561
1.12
2.24
4.49
8.98
3
0.315
0.630
1.26
2.52
5.04
10.10
4
0.353
0.707
1.41
2.83
5.66
11.30
5
0.397
0.793
1.59
3.17
6.35
12.70
6
0.445
0.891
1.78
3.56
7.13
14.30
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