67mm ND2-32 Filters Brass Frame Adjustable HD Ultra-Thin 36-Layer Anti-Reflection Green Film Nano-Xcel Pro Series

SKU: KF01.1996

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Answer: Brass, CNC one-piece molding both hard and flexible, smooth and durable installation. 
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Answer: 36-layer K&F Concept exclusive coating technology 
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Answer: You can install the lens cap, but you need to add 1 size of lens cap. For example, if you buy the filter 67mm, then you need to install 72mm lens cap. 
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Answer: No hoods can be installed. The filter because to avoid the problem of dark corners, especially to increase the diameter of the light through the aperture, the outside diameter of the frame is also increased. 
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Answer: All adjustable ND filters will have this problem, the larger the focal length used the smaller the impact of cross-hatching. There will be obvious cross-hatching and vignetting in the large stop of light reduction, continue to rotate the dark shadow will disappear naturally, which is a physical phenomenon, not a product problem. 
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Answer: By design we can avoid the use of the filter in non-wide angle lens will not have dark corners, if your focal length is less than 24mm still may back to produce. 
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Answer: There is a front thread that allows another filter to be mounted in front of the black soft filter, as long as the larger 1 has the same aperture. For example, if the filter is 67mm, then you need to install 72mm