77mm ND2-ND400 Variable Filter (1-9 Stop), 24 Layers of Nano-coating, K&F Concept Nano-Dazzle Series
SKU: KF01.2362
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From 1 to 5 stops, a slight X-cross appears for lenses under 24 mm. At the highest stop, an X-cross appears, which can be removed by rotating the filter ring; this is normal and not a quality issue.
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No, there is no structural limit.
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The cover cannot be installed. To avoid vignetting, the filter specifically enlarges the opening for clear light, and the outer diameter of the frame is also increased.
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Hello, the VND filter is adjustable to 9 stops.
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7.4mm
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Lens caps can be installed, but they must be one size larger. For example, if you buy a 67mm filter, you will need to use a 72mm lens cap.
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All variable ND filters have this issue: the longer the focal length used, the less the cross-shadow effect is felt. At very short focal lengths, cross-shadows and vignetting are clearly visible. As you increase the focal length, the shadows disappear naturally. This is a physical phenomenon, not a product defect.
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There is a front thread that allows you to mount another filter in front of the Black-Mist filter, as long as the two larger diameters are the same. For example, if the filter is 67 mm in diameter, then you need to install a 72 mm filter.