FX and DX are Nikon lingo for full-frame and crop-sensor (APS-C ?). Only Nikonistas use those terms. The rest of the world says, "full-frame" or "crop-sensor".
There's some confusion around crop-sensor, in that there's more that one size, so writers will often specify which they are referring to.
BTW, I shoot Canon, but fully support Nikon, Sony and other system users. There's no single "best" and the spec wars change constantly. Pick one and stick with it.
Dave
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