Suction. Drone filter, in various versions, mainly consisting of a visually processed glass pane, which was embedded in a metal frame and produces the optical effect (diameter, depending on the version, 35, 37, 5 or 40 mm - to the outer shape, see figure in the Investment). The goods are mounted on the lens of a drone (not part of the BTI decision). The polarizer increases the color saturation and enhances the contrasts, in addition, the reflections on z. As glass and water surfaces reduced. The gray filter extends the exposure time. The product is packed individually or in four (depending on the version) in a protective cover for continuous use and is classified as an "optical element, made of all kinds of materials, for instruments and equipment, set, not of non-optically processed glass, filters".
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[1][1]. DEBTI8565/19-1#653131