In the strip camera the ground image is reflected by a steerable flat mirror to a diameter stationary concave primary mirror. The primary mirror reflects the light through an opening in the flat mirror and through a Ross corrector. It took images of a 6.3 degree wide ground swath by exposing a wide moving portion of film through a small slit aperture. The initial ground resolution of the satellite was 1.2 meters (4 ft), but improved to 0.6 m (2 ft) by 1966. Each satellite weighed about 2000 kg, and returned a single film bucket per mission. The camera and film transport system were manufactured by Eastman Kodak Company.