Nikon has confirmed the banding issue on the Nikon D200
. The issues seems to be solved by changing the output levels (of the sensor?). According to Nikon it is only visible if the image is zoomed beyond 100% and does not happen at ISO 100.
“Images printed at a print size of A3 (297 mm x 420 mm / 11 in x 14 in.) or smaller this pattern is almost undetectable, and therefore should have little impact on general photography and printing.” — Nikon Europe