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Pontos Fortes: Little or no glare compared to other UV filters, lens protection, 99%+ light transmission
Pontos Fracos: Not the cheapest filter out there. Supposedly harder-than-usual to clean due to its coatings.
Resumo: I use this on a higher end Canon zoom, and find it's about as close as you can get to having the protection of a UV filter without any detectable negative effect on image quality. I rarely take it off. (And I do actually use the S-HMC, aka SMC, Hoya filters on all my lenses for peace of mind.)
Haven't had to do a marked cleaning yet, but would suggest having a Lens Pen and / or Formula MC on-hand to clean it when it eventually needs it (the Lens Pen has worked fine for me with light cleaning).
I know there are those who don't like extra glass between them and their subject, but I have yet to have issue with this line. On the other hand, all it takes is an occasional large dust speck or water spray or something landing on the filter rather than the lens itself for me to be glad it's there as I wipe it down.
This easily fits in the category of "if you're going to buy a protective filter, make sure it's one that won't negatively impact your images," and I find the peace of mind that my lens has some protection other than just the hood when it's on well worth it.

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