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The issue is that even the blackest of commercially available paints are still no better than dark grey when light is glancing off at a shallow angle.
Materials like flock paper and velvet work well by changing the nature of the surface into a light trap instead of just a coating on a flat surface.
The next best thing is to coat the inside of the ota with somethign to give it a texture eg fine sawdust, before painting. This reduces the surface area which will reflect light from shallow angles toward your optics.
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