Diffraction Point Spread Function (PSF): The PSF is calculated by
FFT from the wavefront aberration. The ray density in the pupil may be
increased to improve the accuracy of the PSF. The PSF may be displayed
as perspective wiregrid plot, grayscale intensity plot, false color
plot or "true" color plot. Not included in OpTaliXLT 

Diffraction Point Spread Function (PSF): Shown as grayscale intensity plot. Not included in OpTaliXLT 

Diffraction MTF: The Diffraction Modulation Transfer Function (MTF) is computed by autocorrelation of the complex pupil function (derived from wavefront). It may be computed vs. field (as shown left), vs. spatial frequency, vs. focus position or as a 2dimensional MTF at a given field number. MTF vs. field position is always shown for three spatial frequencies. Not included in OpTaliXLT 

Diffraction MTF: As shown to the left, diffraction MTF
is plotted vs. spatial frequency for all specified fields. Not included in OpTaliXLT 

Wavefront: Plot wavefront aberration vs. fields or wavelength.
Vignetting is also correctly reproduced. Not included in OpTaliXLT 

Strehl ratio: Plot Strehl ratio vs. field or wavelength.
The parametric plot to the left shows Strehl ratio vs. wavelength for a
typical apochromatic refractor lens, each curve representing a separate field point.
The blue curve is onaxis while the red curve is at a semifield diagonal
of 0.5^{o}. Not included in OpTaliXLT 