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A comment on How to Find Hidden Cameras and Spy Gear. Parent comment

Re:How to Find Hidden Cameras and Spy Gear by ILBCNU on Wednesday January 16, 2019 @11:00PM (#18928257)
yes thats what the red "ruby" lens coating is about, it buffers reflection from the lens surface.

https://en.m.wikipedia.org/wiki/Optical_coating

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