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"The latest lenses feature enhanced coatings to reduce flare and ghosting, am I impacting this by using a UV filter?"
Alan Slater, Reading
BRIAN SAYS… Every time light passes through a layer of glass it has an impact on the light. Your filter becomes a new element in the optical path of your lens, that wasn’t part of the design created by the manufacturer. So as a protection, I generally use a lens hood instead of a filter.