The size of the front end of the filter is one size larger than that of the rear end lens, If 67MM filter is purchased, the front end size is 72mm. this Filter from Haida combines a solid variable neutral density filter with a circular polarizer. | It can rotate adjustment neutral density filter darkens the entire image area to easily photograph with a longer shutter speed for added blur or to convey more movement. | Circular polarizers are ideal for use with digital cameras and autofocus lenses，Clears up haze in distant landscapes and provides more saturated, vivid colors.Strongest effect when used at a 90° angle from the sun. | The filter is made of optical glass for clarity and color fidelity. To prevent internal ghosting and reflections, each surface includes multi-coating of anti-reflection coatings. In addition, the Nano coating provides an additional layer for improved beading when the surface comes in contact with water or oil, allowing for easier cleaning. | Please verify your camera's lens thread size before ordering. Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap.If you have any questions about Haida products, you can contact us at any time.