Negative Positive
Title: Don't use with a 50mm
Review: While this basic filter, does physically protect your lens for cheap... I warn you that when I put it on my 50mm f/1.4, *every* picture (99% use in low light) that contained a light source had light flashes/reflections - which completely went away when I removed this filter.I haven't tried with a coated filter yet, but I don't usually shoot in harsh conditions (ie. sandy, misty, etc...), I will likely leave a filter off my 50mm lens when shooting.UPDATE: it got annoying screwing the filter on/off, so now it just sits in my bag. I can only imagine using it in adverse conditions (windy, mistly, etc...) - for now will use a lens hood.
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