During public sessions at the Highland Road Park Observatory, and during outreaches offered by the Baton Rouge Astronomical Society, the public is instructed to not utilize cell phones usual it "know how to make the phone glow red"--emit red light. There is a simple setup which allows iPhone users (at least) to toggle between red light and the regular setting.
The instructions are to be found here...
http://www.skyandtelescope.com/observin ... or-iphone/
The bane of every astronomer's existence.
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