User ID wrote:
Well, yes, he DOES want want a filter to protect the lens but, evidently, you are unable to recommend one. Hoods are nice too. They can enhance resale value when you include them with used lenses for sale. Caps are also very useful for keeping your filters clean. As to filters being thin, acoarst thaz intentional. The thinner the better.
I've owned an EF-S 18-135 lens since 2009. It has never had a protective filter on it, and it looks as good as it did in 2009. In fact, I own dozens of Canon, Nikkor, Sigma and Tamron lenses and none of them have protective filters on them. Just caps and a hood. Since he just got an EF-S 18-135, which is basically a beginner's lens, I was simply trying to say he doesn't need a protective filter. A lens cap and hood will protect the lens better than a really thin piece of glass. My recommendation is don't waste money on protective filters.