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this bit steve, how do we tell the system the PSF. i know the aperture and central obstruction etc so what is the PSF for my scope?
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The PSF is the
Fourier transform of the aperture: the square of the difference of two Bessel functions of the first kind; one for the mirror and another for the obstruction. It is wavelength dependent. (Theoretically it could also include things like mirror clips and spider vanes, so you could deconvolute all the diffraction effects due to these. I'm sure this is done for images taken with professional telescopes, but it would be rather tedious for amateurs. You would probably need to write your own image processing software from scratch.)
I will get back to you on the exact form when I get a chance to work through it. Meanwhile try letting the software work backwards from the convoluted image to figure it out. If the DC algorithm is any good this should work just as well.