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Anonymous
I think it's just got a load of little grooves etched into the filter glass that reflect light along them - at least, that's how the filter looks. I'm sure there's a bit more to it than that, though, since the stars are always nicely centered on the source of light.
I think it's really meant for little pinpricks of light, such as jewelry and city lights and things, but this demonstrates what it does just as well.
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