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The stupid question regarding filters
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15-11-2021, 01:24 PM
Stonius
(Markus)
Registered User
Join Date: Mar 2015
Location: Melbourne
Posts: 1,495
The way to tell is to hold something near the filter and observe the reflection in the filter. If one side gives you a double reflection and the other gives you a single reflection, the filter is directional.
Cheers,
Markus
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