Variable neutral density (ND) filters are handy tools for photographers, in that their opacity can be adjusted simply by rotating them. So, why not use them for adjustable-tint sunglasses? Well, ...
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K&F Concept Variable Fader ND Filter 1-8.6 stops review
The K&F Concept Variable Fader ND Filter 1-8.6 stops is one of the most affordable VNDs on the market, so should you get one?
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