Hi, This is my first dslr I have found this camera to take acceptable quality pictures but I'm have a bit of a problem with noise the camera is a d50 with an Nikon dx18-70ed with the on camera flash on and in ap mode iso 1600 some of the pictures taken inside have noise in them only in the darker areas like a person wearing a black shirt or just in the darker areas in general is there a setting I'm over looking I bought a flash sb 600flash set up I haven't experimented with it yet all feed back will be greatly appreciated thanks.