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So I am doing a new security camera setup at a carwash and know nothing about how I'd get a wider or narrower angle for viewing. (Camera noob) The cameras I've got are pic related (Clearview IPB-82A). Boss man says he doesn't like the angle that wide after seeing them and wants something slightly narrower. This has a 3.6mm fixed lens. Would I search for a higher or lower number for the lens size if I wanted it to be narrower?