ND64 Square Filters (1.8/6 Stops) 100*100mm Optical Glass Neutral Density Gray ND Filters Ultra Slim HD Nano-Coating Waterproof & Scratch Resistant

SKU: KF01.1146

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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. 
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With my Fuji with the 10-24 I have small field of view restrictions at 10-15. 
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49mm to 82mm. The largest adapter ring is an 82 to 82 mm, into which you can also screw an 82 mm polarizing filter, as with all other sizes. The outer diameter of all adapter rings is of course even larger. 
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This is possible if you don't have a suitable adapter ring. However, when reducing larger lens diameters, caution is required because of possible vignetting. 
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So with my sigma 10 20, only a little with 11 mm but no longer visible with 12 mm (aps-c)