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Anonymous
It's not total snake oil, almost....
The big difference is that digital cameras don't have problems with UV light like film does, so a UV filter is (mostly) not needed, in fact using one one a digital camera might even give an odd color cast to pictures.
In that sense it's wiser to use a plain (NC) filter to protect the front element of any lens you plan on using on a digital camera, should you actually feel the need to do so.
Actually, this hasn't answered the question at all. It is snake oil...
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