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2 reasons that I use filters.
1. I hate cleaning optical surfaces. This includes all my computer monitors. I think it comes from reading so much about detailing black cars. The slightest bit of dirt on the cleaning cloth/sponge will put scratches all over what you're cleaning. Ugh. I feel much better about cleaning a filter than the lens.
2. I often find the lens cap has fallen off the lens in my bag. I hate to think of the lenscap grinding against the front element in my bag.
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