2 Camera position When a camera is installed to produce true vertical pictures it is known as a 'single vertical camera'. If more than one is installed in the aircraft, they are numbered from nose to tail, e.g. V1, V2 etc. The single letter F indicates a fan of two or more cameras. Cameras are numbered according to the area of ground photographed, e.g. in a fan of four cameras, the camera photographing the ground on the extreme left would be numbered F41. F. S Indicates a starboard-facing oblique camera.
P Indicates a port-facing oblique camera.
N Indicates a nose-mounted oblique camera. If there is more than one, they are numbered from port to starboard, e.g. N1, N2 etc. T Indicates a tail-mounted oblique camera. This appears in figures only, e.g. 52 means No. 52 Squadron. This serves to distinguish between squadrons of the same number but belonging to different Air Forces.