Post B6trD93Z9RmzgbJutM by mwichary@mastodon.online
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 (DIR) Post #B6trD7UQya5opLsLUe by mwichary@mastodon.online
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       I am familiar with Fresnel lenses and louvres and hoods, but does anyone know what is this treatment called and maybe what it accomplishes?
       
 (DIR) Post #B6trD93Z9RmzgbJutM by mwichary@mastodon.online
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       Answer thanks to @vathpela: Holophane Spider Web Lenses!https://www.kbrhorse.net/signals/lenses01.htmlApparently it’s to reduce the likelihood of external light reflecting off of signal and making it appear lit when it’s not.