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bahtinov mask for a 16inch truss telescope

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hello im trying to find a bahtinov focus mask does anyone know of a good place to buy one from this is the telescope Revelation 16" f/4.5 M-CRF Truss Dobsonian (Black) not sure witch type to buy 16" Parabolic primary mirror 1/12wave
Focal length: 1800mm, F/4.5 mirror is 400mm but the opening on the telescope inside to inside  is 470mm  so really not sure witch size to go to or is it just 1800mm focal length and 400mm aperture  is all i need to know

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