When I was in school for photography 30 years ago, my teacher said to never put a lens filter on a lens, simply to protect the lens. His reasoning was why put a $100 piece of glass over a $2,000 one. He thought the filter would lessen the quality of the image taken. Since then, I've gone back and forth using and not using filters for protection. I'm not sure I can tell a difference. Is there one? I want to protect my lenses, but not at the expense of image quality.
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