RE: purpose of sunshields
Sun Shades was originally intended for snipers.
It cut down the glare from the lens and made it harder for a counter-sniper to spot "you"
It began as a simple colored plastic "lens" like the filters in the GI angleheads.
With advances it is now multipurpose.
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"I can't say as ever I was lost, but I was bewildered once for three days." Daniel Boone
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