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Cx, Cy not equal to specs?

My K(intrinsic parameter) from opencv calibration is CX = 378.322 and CY = 222.498. Imager resolution is 752 (H) x 480(V) divded by 2 = 376 and 240. Im not saying it shouldnt be that but I am wondering because I have seen instances in which folks just set CX and CY to 1/2 imager vertical max and 1/2 imager horizontal max. Which should I do?