72mm ND2-ND32 (1-5 Stop) Variable ND Filter and CPL Circular Polarizing Filter 2 in 1 for Camera Lens No X Spot Weather Sealed Nano-Xcel

SKU: KF01.1086

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50 mm Yongnuo lens filter size is 58mm, you can reconfirm your lens mark as "ø" (diameter) symbol, if the number is 58mm, it would be ok ,thanks. 
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50 mm Yongnuo lens filter size is 58mm, you can reconfirm your lens mark as "ø" (diameter) symbol, if the number is 58mm, it would be ok ,thanks. 
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Hi, if you want screw other filter or lens cap on this filter , need larger size than multifuctional filter , if you order 77mm ND2-ND32&CPL filter , the front of lens cap or filter need 86mm, of course you can use filter adapter rings , but too much filter added , it might be caused dark corner. 
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Hi, if you want screw other filter or lens cap on this filter , need larger size than multifuctional filter , if you order 77mm ND2-ND32&CPL filter , the front of lens cap or filter need 86mm, of course you can use filter adapter rings , but too much filter added , it might be caused dark corner. 
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Yes, and another filter can be screwed on to it. 
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Yes, and another filter can be screwed on to it. 
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The plastic is probably a component inside (adjustment ring slider?). The threads and external build is a metal. I’ve had no issues and I have several in different sizes. 
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I have a sigma 18-35mm f1.8 art series, it should fit if you have the same one