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The Nikon AW 40.5mm NC Filter is a specialized filter designed specifically for 1 NIKKOR AW lenses featuring a front filter thread diameter of 40.5mm. This filter helps to reduce the likelihood of condensation on the lens when photographing under or near water in order to maintain a natural level of clarity and contrast.
The filter is intended for use on the waterproof AW 1 NIKKOR lenses and is capable of performing underwater to depths up to 65.6' when used on the 1 NIKKOR AW 10mm f/2.8 lens, or depths up to 49.2' when used on the 1 NIKKOR AW 11-27.5mm f/3.5-5.6 lens.