The grazing incidence reflection can be eliminated with proper rough texture blackening of the exposed surfaces. An extremely good combination that I recently used to cover the inside of my CCD imaging train is anti skid paint additive stirred into flat black optical paint. http://www.behr.com/behrx/act/view/products_detail?prodGroupId=11&catName=Specialty&catId=10&from=search That eliminates the unnecessary high effort of machining of conical baffles and allows simple use of plain pipe.
Try it on a test piece before continuing and you will be convinced!
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Re: My thread for building a 12.5" RC.
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