Name: Supercolor AutoFocus 3500 Brand: Polaroid® Type: Integral SX-70 Year of manufacture: 1970s. Lens: 116 mm / 3 elements Shutter: Electronic with cell Speeds: auto exposure Aperture: f/9.4 Focusing: Sonar autofocus ISO : 150 Scarcity index: courant Description: This model is similar to the "Pronto! Sonar OneStep" except the front that is white instead of black. Comes with copy of the operating instructions. POLATRONIC 5 FLASH Sits on top of the camera takes 4 x 1.5 v AA For the auto focus ultrasonic 3500, 4000 and 5000 and all the non-folding type SX-70 sonar cameras.