56-day SMEAT simulation; the crew used the shower after exercise and found it a positive experience. Cameras and film There was a variety of hand-held and fixed experiments that used various types of film. In addition to the instruments in the ATM solar observatory, 35 and 70 mm film cameras were carried on board. An analog TV camera was carried that recorded video electronically. These electronic signals could be recorded to magnetic tape or be transmitted to Earth by radio signal. It was determined that film would fog up to due to radiation over the course of the mission. To prevent this, film was stored in vaults. Personal (hand-held) camera equipment: Television camera Westinghouse color 25–150 mm zoom 16 mm film camera (Maurer), called the 16 mm Data Acquisition Camera. The DAC was capable of very low frame rates, such as for engineering data films, and it had independent shutter speeds. It could be powered from a battery or from Skylab itself. It used interchangeable lenses, and various lens and also film types were used during the missions. There were different options for frame rates: 2, 4, 6, 12 and 24 frames per second Lenses available: 5, 10, 18, 25, 75, and 100 mm Films used: Ektachrome film SO-368 film SO-168 film Film for the DAC was contained in DAC film magazines, which contained up to 140 feet (42.7 m) of film. At 24 frames per second this was enough for 4 minutes of filming, with progressively longer film times with lower frame rates such as 16 minutes at 6 frames per second. The film had to be loaded or unloaded from the DAC in a photographic dark room. 35 mm film cameras (Nikon) There were 5 Nikon 35 mm film cameras on board, with 55 mm and 300 mm lenses. They were specially modified Nikon F cameras The cameras were capable of interchangeable lenses. 35mm films included: Ektachrome SO-368 SO-168 2485 type film 2443 type film 70 mm film camera (Hasselblad) This had an electric data camera system with Reseau plate Films included 70 mm Ektachrome SO-368 film Lenses: 70 mm lens, 100 mm lens. Experiment S190B was the Actron Earth Terrain Camera. The S190A was the Multispectral Photographic Camera: This consisted of six Itek 70 mm boresighted cameras Lenses were f/2.8 with a 21.2° field of view. There was also a Polaroid SX-70 instant camera, and a pair