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58mm CPL Filter 28 Layer Super Slim Circular Polarizing Filter Multi-coated Polarized MRC Filter NANO-X Series

SKU: KF01.971

Q
What do you mean by waterproof? The filter has two pieces that rotate relative to each other. Will that seam between the two pieces leak water if I use this filter underwater? How deep can it be used before it leaks? Will salt water damage it?
A
hello,waterproof refers to the surface of the filter has a waterproof film, if water drops on the filter, the water will directly slide off without leaving water marks on the filter, then it is easy to clean.we do not recommend that you use in the water, the water will enter the CPL inside the seam. 
Q
K&f concept 58mm circular polarizer filter 0 is this filter made of resin or glass?
A
hello， the filter is made of glass