How to Use a SLR Camera...
Single-lens reflex (SLR) cameras allow photographers to see the exact image that will be captured by using a semi-automatic moving mirror system. Non-SLR cameras use a viewfinder system which means that what is seen through the viewfinder is not necessarily what will be captured on film. There are also Digital SLR (DSLR) cameras which use a mirror positioned behind the camera lens to direct light toward the viewfinder...
