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Message: <blockquote data-quote="Horoscope Fish" data-source="post: 387150" data-attributes="member: 13090">No, they're not the same thing. Neutral Density filters cut light transmission equally across the spectrum to reduce shutter speed while a Circular Polarizing filter polarizes light. This reduces or eliminates reflections. Yes, it also cuts the overall light transmission reaching the sensor but that's a by-product of polarizing the incoming light.Here's a really good video demonstrating <a href="https://www.youtube.com/watch?v=vMOsBG2JaZY" target="_blank">why you might want to consider using a CPL</a>; I rarely shoot outdoors without one.....</blockquote>