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37-40.5mm Step Up Ring Aviation-grade Aluminum Filter Adapter Ring 2-pack with a Cleaning Cloth

SKU: KF05.329

Q
What do the numbers on the adapter ring mean?
Answer Question
A
The numbers on the front of the adapter ring are the diameter of the lens to be adapted, and the numbers on the back are the diameter of the filter to be adapted (the numbers after the ø symbol on the front of the lens are the diameter of the lens)
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