Bahtinov mask for Sigma APO 70-300mm
thingiverse
I modified Ella's/Brent's Bahtinov Mask for a Sigma APO Zoom Lens 70-300mm, implementing a very narrow pattern, just 0.8mm wide, to achieve a large diffraction pattern. The photo still shows the Samyang version because I haven't yet received my customized Sigma mask from the manufacturer. I ordered the custom-made Bahtinov Mask at MeltWerk, where they produce all items using SLS (Selective Laser Sintering) technology in PA12 material. According to their specifications, the fine 0.8mm bars are at the absolute limit of what can be manufactured.
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