I owe a Nikon D70 and a Flash SB 800. Whenever i set my camera body to Rear flash mode my flash is not automatically set to Rear flash. It remains on the TTL mode. I cant find the way to directly set to rear flash mode on the flash itself. I used to set the Rear flash mode on the camera body itself and the flash was set authomatically to rear flash mode. now it's nomore the case. How do i set the rear flashmode to my camera and to my flash?