100*150*2mm Soft GND8 Square Filter HD Optical Glass Waterproof ND Filter - X-PRO Series
SKU: SKU.1810
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At least in the pictures I don't notice any disturbing reflections. Always remember that lenses can also produce something without a filter, especially with backlight, for example when the sun is low in the sky.
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Yes, that is possible with my lenses
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There are coatings on both sides, and the middle is transparent.
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They fit all filter holders that don't have to have an additional seal glued to the filters. I use it myself with the Rollei Mark II filter holder and the Haida M10.