Convert a desired spatial frequency and known collimator focal length into a 4-bar target width in inches.
4-Bar Width Calculator
Target feature guidance
Standard feature tolerance is +/- 0.0005 inches for target features larger than 0.0050 inches. For features of 0.0049 inches or smaller, the standard tolerance is +/- 10% of feature size. Tighter tolerances are available if required.
| Model | Maximum Bar Width (inches) |
|---|---|
| 312 | 0.1616 |
| 313 | 0.2727 |
| 314 | 0.1252 |
| 315 | 0.4850 |
| 316 | 0.2727 |
| 317 | 0.2727 |
