I bought this filter for my new 50mm f/1.4 lens. Great for daytime shots, but creates ungodly flare at night. It mirrors streetlights and even bright stars onto the opposite side of the picture, so all my night shots look like there's UFOs flying around in them. If you need to point the lens into bright lights - which always creates problems - you'll need to remove this filter lest it compound those problems.
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