Customers most agreed on the following attributes:
We just bought a Canon 24-70mm L lens; of course with such an expensive lens you want to do what you can to protect it, so a UV filter such as this is a natural choice. The construction is solid, the glass of high quality and it comes from a reputable manufacturer. It's really a pretty passive piece of equipment, but as such things go it's recommended. This is the second one we've bought, the first being mounted to our 17-40L.
Great filter. Great price
Great UV filter. Highly recommended.