Apparatus for analysing the output of a camera; camera apparatus; camera body caps; camera cases adapted or shaped to contain a camera; camera control apparatus; camera filters; camera housings; camera lenses; camera mounts; camera rails; camera range finders; camera shutter releases; camera shutters; camera slings; camera stands; camera straps; camera tubes; controllable camera shutter mechanisms; electrical door entry apparatus in combination with a video camera; multiposition camera stands made from aluminium and steel tubing; squeeze blower brushes for cleaning camera lenses; television camera tubes; video camera security apparatus; video camera security installations; video camera security instruments; video multiplexing apparatus for use with video camera installations