Distortion Control Data for Nikon D90 and D5000 firmware update (Ver. 1.002)
Nikon has provided a free Distortion Control Data update for the D90/D5000 (firmware version 1.002). Distortion control data are used to correct barrel and pincushion distortion during shooting and editing. This update includes support for the latest Nikon lenses and it can be loaded into cameras that support distortion control.