This is a good, affordable UV filter for protecting your expensive lenses. I leave it on my lens all the time. This particular filter (L-39 Sharp Cut) is especially good for wide angle lenses (< 24mm focal length), because of its ultrathin profile, which prevents vignetting. I have used regular filters on wide angle lenses, with very bad results. Although this filter is NOT multi-coated, I have not found it to be a big deal in the pictures I've taken. Multi-coated UV filters can cost 2x or 3x the price of this one, which I don't think is worthwhile. All in all, I recommend this filter for Canon or non-Canon lenses.
Canon 77mm UV Haze

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