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I forgot to say the mask was a Kendrick for 80mm telescopes from Bintel.
Serial number on their (Kendricks) site BM-6004-P.
If you use the web generator for short focal length optics the bars get ridiculously thin.
I would say this mask would work for any lens it is just a matter of taking test images and zooming in to see the diffraction pattern.
Bert
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