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USAF pattern is printed in black, red, yellow, and blue to test for chromatic aberration and at 90° for testing astigmatism.
| 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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