"D3100, D3200, D5000, D5100 Distortion Control Data Firmware Update"
Nikon has posted a Distortion Control Data Firmware Update. Distortion control data are used to correct barrel and pincushion distortion during shooting and editing. They can be loaded into cameras that support distortion control. The D3100, D3200, D5000, and D5100 are some of the DSLRs which support DC.