“What does the 40.5 refer to? Is this the inner or outer diameter of the lens that is covered?”

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• Inner diameter, where the screw threads are.

  Answered by Amateur 5 years ago

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• The 40.5 mm refers to the diameter of the lens. The diameter of the lens is usually on the lens body.

  Answered by InsigniaCustomerSupport 5 years ago

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