Nikon has released a firmware update for the D300. The new Version 1.02 adresses “[a]n issue that, in rare cases, caused vertical bands (lines) to appear in images captured at shutter speeds slower than 8s has been resolved.” You can download the firmware update via the following pages:
D300 Firmware update 1.02 – Windows
D300 Firmware update 1.02 – Macintosh




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