Instruct: Classify an Amazon review as either positive or negative.
Query: No free lunch!

You get what you pay for. Why spend $1500 on a Canon L series lens and then put a cheapo filter on it? You paid big bucks for a lens so you could have the best image quality available, didn't you? So then why put a cheap $10 piece of glass over it to distort or cloud your images? This filter is rock solid. The weight and feel are heavy duty and the threads are precision. And if your lens is a Canon L series lens than you know the weather sealing on it doesn't include the front element unless you have a filter on it. And it's also a good insurance policy to protect the front element from accidental scratches. But those aren't the reasons I bought this filter. I bought it because I was tired of UV haze washing out my photos anytime I was down at the lake or out on the coast. This filter clears up the images beautifully.