The transfer from your camera to the computer is a digital transfer - not analog. So even with a bad cable, there is no 'degradation' of image. If the cable is bad, the transfer simply doesn't work.
For short runs, as long as there is a solid fit in the camera and computer receptacles, most cables from reputable manufacturers will be fine. If you are running 16' or even 32' cables - then the manufacturer is pretty important.
Having said all this, Granite Digital sells a line of cables that are well made, well shielded and very reliable. I know there are others.
good luck.
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