Quote Originally Posted by Dablaze11
that would be dust... might want to check your image sensor... i have dust on mine and i think i might have to send it back to nikon for them to fix it. ugh

either the little squeeze ball blower or caned air is great for cleaning sensors. Just be sure not to be an idiot and touch the sensor with anything.

also, always have the camera facing the ground when the lense is off. Never let it face upwards. That will help prevent dust.