77mm True Color & Ultra-Low Reflection Variable ND Lens Filter, ND2-32 (1-5 Stops) HD Adjustable Neutral Density Filter with 28 Multi-Layer Coatings for Camera Lenses - Nano-X Series

SKU: KF01.2081

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No, this filter is infinitely adjustable. 
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It cannot be used with a lens hood, as the filter's front end is larger than the lens' aperture. 
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The filter frame is 7.4mm thick, suitable for use with a 19mm lens aperture for photos and a 17mm lens aperture for videos. 
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Yes, but you need to stack a larger filter (e.g., 52mm to 55mm), and you'll also need a larger lens cap. 
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The reflectivity is 0.15%