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Old April 16, 2019, 04:07 PM   #4
Join Date: March 4, 2005
Location: Ohio
Posts: 17,161
We used to use opaque tape donuts meant for circuit board layout (before computers) to do this. Someone also had a suction cup with a camera iris type variable size peephole that you stuck to your shooting glasses. Looks like this is basically a large tape donut type, except using an electret instead of adhesive to make it stick. Good idea. I'm a little surprised it was patentable, as glasses pinholes have been used for so long and electrets have too, but I guess nobody thought to put the two together before.
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