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Focus mask for large Dob


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If you can't find a supplier of a ready made one, it might be worth using one of the on-line Bahtinov generator programs to produce a suitably sized one and then submit it to one of the laser cutting services?  I did this some years ago for my 8" and used black acrylic but for 20" perhaps aluminium or even thin steel might be more appropriate.  

Might also be worth cutting one out of cardboard using the generated pattern to make sure it works OK before investing in the real thing?

Edited by almcl
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On 26/11/2021 at 12:43, almcl said:

If you can't find a supplier of a ready made one, it might be worth using one of the on-line Bahtinov generator programs to produce a suitably sized one and then submit it to one of the laser cutting services?  I did this some years ago for my 8" and used black acrylic but for 20" perhaps aluminium or even thin steel might be more appropriate.  

Might also be worth cutting one out of cardboard using the generated pattern to make sure it works OK before investing in the real thing?

I made one out of cardboard for my 40cm using a design from one of the on-line resources. It works so well that I haven't spent any money on a more robust version.

I confess: I never thought that I would rule an optical diffraction grating with a craft knife!

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