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Message: <blockquote data-quote="Rick M" data-source="post: 72604" data-attributes="member: 4399">The main differences in CPL's are glass quality, coatings and the layer which polarize the light. Glass- Think cheap lens or great lens, you really get what you pay for.Coatings- These reduce reflections between the sensor, AA filter, lens and filter. There can be a lot of internal reflection going on. They also make them MUCH easier to clean.Foils-The material which polarizes the light, some are better than others, leading to better QI.The Better filters also use brass rings, less likly to get stuck.It all comes down to your budget. I would have low expectations on a $10 CPL.</blockquote>