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Old 10-25-2017, 08:13 PM   #15
NullNix
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Posts: 929
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Join Date: Jan 2013
Location: Ely, Cambridgeshire, UK
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Quote:
Originally Posted by vrf View Post
I've never seen the issue in person, but maybe some sort of prism-ing effect with the light hitting the light guide at such a long angle?
It's just as likely to be sweat etc from the fingers triggering diffraction effects in a sufficiently thin layer.
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