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What is the difference between f/6 or f/1.8 in dx and fx nikkor lens?

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    This question is unclear. Are you asking whether there is a difference in exposure between formats, or about different lenses on the same body? Or just about what different f numbers actually mean? – Please Read My Profile Dec 15 '13 at 15:04
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The f-number is the ratio of a lens's focal length (distance from lens to sensor, roughly speaking) to the diameter of the pupil through which light enters (see http://en.wikipedia.org/wiki/F-number).

Having said that, there is no difference between f/6 on DX or FX format lenses, as there is no difference between f/1.8 on DX or FX format lenses - the ratio's are the same for each lens type.

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