采用 DISC
Distortion, calibrated. This operand computes the calibrated f-theta distortion across the y-field of view at the wavelength defined by Wave, and returns the absolute value of the maximum deviation from linearity of the f-theta condition.

校准畸变。该操作数计算由Wave定义的波长的y视场的校准f-theta畸变，并返回根据f-theta线性条件计算得到的最大畸变的绝对值。如果Absolute是0，返回值的单位为百分比；如果Absolute为1，畸变作为一个绝对长度给出而不是百分比。这个操作数对设计f-theta镜头很有帮助。