Seidel Aberrations, Point Spread & Transfer Functions

Third-order Seidel aberrations at a fixed field can be converted to Zernike polynomials by using Wavefront(aberr::Zernike.Aberration) where the Aberration constructor accepts the standard wavefront error coefficients.

OTF(ΔW) & MTF(ΔW) yield the Optical & Modulation Transfer Functions as matrices for the input Wavefront.

The MTF can be plotted using the methods mtf_plot & mtf_plot! which accept the MTF matrix. mtf_plot(mtf) will 3D surface plot it in full, while mtf_plot(mtf, :x) & mtf_plot(mtf, :y) will plot the radial profile along a sagittal or tangential slice; the mutating version mtf_plot!(mtf, x_or_y::Symbol) allows you to superimpose a different MTF on the existing plot.

The PSF(ΔW) function yields the incoherent Point Spread Function normalized by the diffraction limited peak intensity; the psf_plot & psf_plot! analogs behave in the same manner as the MTF plot methods.