UV Filters - How useful are they REALLY? With actual testing!!

Interesting - he must have had fun with that. I never thought of them as protection from impact, but rather dust, grime, grit, etc. I finally decided fairly recently that I'm very careful with equipment and never had any grime or grit on my filters, and the dust is easy to blow off, so I stopped using them.
I thought this thread was going to be filled of pictures of UV filters used as coasters. :)

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