The Spectra System SE produces 9.2 x 7.3cm images (rather than 600 or SX-70 film's square format) and was released in 1997. The camera has a 125mm f/10 3-element quintic lens and uses a sonar rangefinder to determine the distance to the subject. Silicon photodiodes make up the photocell that measures light from the scene and flash if used. The glass coated lens is capable of focusing from 2 feet (.6m) to infinity. The back of the camera has six switches and from left to right they are 1 Foot to meters selector that changes between the two depending on where the switch is. 2 Audio Signal switch that toggles the sound on and off. 3 Self-timer switch that gives you time to get into the picture when in the down position. 4 Sonar autofocus over-ride switch that lets you turn the autofocus system off. 5 Programmed flash switch that lets you turn off the built-in flash unit. 6 The three position exposure control switch that goes from light, medium, and dark settings. The back also has the rapid-recharge LED indicator that is lit green when the flash is ready, the remote plug-in socket, and a frame counter window. The power for the camera is carried in the film and is renewed with each new 1200 Polaroid pack film.