I agree. They are glazing materials after all, not optical flats, so the glass itself might be less than perfect, and the coating process is not going to be up to the standards of optical components, especially given the comparatively huge surface areas to be coated. At the time my intended application was a 4x5 carrier but I was only experimenting to see if the glass was effective so I wasn’t as concerned with blemishes (these were free samples of the type normally sent to framers so I didn’t expect anything pristine). The larger the size you need the more difficult it will be.
I also found them finicky to clean.
For the type of application in the article, imperfections will be magnified, however since the process is digital I assume issues like this can be fixed in editing so glazing materials are probably worth considering as an anti-Newton ring solution.
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