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Mert- Your horizontal cuts should start in the center axis and mirror out. I think the odd spacing of the cutouts will make the diffraction spikes wide. they still will be in the center if the axis is centered, but may be too wide to see a clear difference between the angled and straight spikes.

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Thanks Jerry for pointing this out, I was out last
night trying the mask I posted.
Never had such a good focus, soo easy and clear in soo
little time, though the spikes were not so clear as
you pointed out!
Still I got FWHM of 2" which is unknown for me
in the area where I live, with the eyes I have to focus.
I will make more masks to try out different setups before
making the final one.

Thanks and regards,

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Mert
42º49"N 1º38"W
3" Polarex refractor
6" F12 SW Maksutov,CS2-S
EQ6 + EQMOD
SPC900NC/DFK21AU04.AS
My web-page don't laugh, I should make it better!

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