Determining 4-Bar Width Calculator

The below calculator allows a user to convert a 4-bar target bar-width size into inches from a specific spatial frequency value (cy/mrad) and a known collimator focal length.

If you are interested in determing an appropriate set of targets for performing an MRTD analysis please click here.

Note: standard feature tolerance is +/- 0.0005" for target features larger than 0.0050". For targets 0.0049" or smaller the tolerance is +/- 10% of feature size. For example, a pinhole target that is 0.0030" diameter would have a standard tolerance of +/- 0.0003". Tighter tolerances are available if required.

Please note the max. bar width that can fit in our target wheels:

Model | Max. Bar Width (inches)