100*100mm Natual Night Square Filter Light Pollution Filter for Night /Sky/Star/Astrophotography Waterproof & Oil Resistant Nano Coating

SKU: KF01.1144

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Yes, the 2mm Japanese optical glass maintains natural colors without obvious color cast. 
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This 100x100mm square filter works with compatible holders for Canon, Nikon, and other camera lenses. 
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Its nano coating resists water, oil, and everyday scratches effectively. 
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It reduces urban glow, improving contrast in night-sky photographs noticeably. 
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I think there are 6 rings for different sizes and 72 MM is there 
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It came with the 10 stop glass filter and seems to be pretty great quality. I'm loving using it. Even ordered a 6 stop to go with it. 
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That's fine. The polarizing filters also have a rotary thread on the front where the filter plug-in system can be attached. 
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Yes, because as far as I know there are no differences. 
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You choose the diameter that is written on the lens. That is the right size for the lens. This is an assignment that you know which lens belongs to which. 
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I don't know exactly what you mean, but the holder fits 3 filters. I often use all three, e.g. Graduated filter, graduated filter reverse and ND in different strengths.