On a Nikon DX lens, "F-n" refers to the maximum aperture setting of the lens, where "F" stands for the f-stop number. For example, an "F/1.8" designation means the lens has a maximum aperture of f/1.8, allowing more light to enter, which is beneficial for low-light conditions and achieving a shallow depth of field. The "n" typically denotes the specific model or variation of the lens, such as "F-Mount."
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