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Using the OSC fan

The OSC (Offense against the Sine Condition) is a plot of OSC versus pupil coordinate that allows you to judge the zonal contribution to coma.

To open the OSC window:

  1. Select from the menu Analysis > Fans > OSC

osc finite

The OSC is displayed as a function of the normalized pupil coordinate. A tangential scan is made, using the y radius of the entrance pupil. The options button will summon a utility window that will let you change the number of points at which the OSC is calculated.

See also