Folding SX-70 Cameras: ALL Folding SX-70 Cameras have the following features in common: 4-element 116mm f/8 glass lens Minimum focus: 10.4 inches Front-cell focusing via geared wheel at top of lens/shutter housing Electronic shutter Programmed automatic exposure-- shutter speeds from >10 sec to 1/175; aperture range f/8- f/22; smaller apertures possible when flash is used. Auto flash exposure based on focus distance; Max flash distance 20ft. Has built-in Flashbar socket for flash. Accessory electronic flashes were also available. Socket for an electrically-actuated remote shutter release.