cameras. However, the film loaded in a Single-8 cartridge has exactly the same dimensions as Super 8 (though it is made of a thinner and stronger polyester base, rather than the acetate base of Super 8 film), and can be viewed in any Super 8 projector after processing. However, Fuji recommended that only tape splices be used when combining Single-8 footage with Super-8, as standard film cement would not adhere to the Single-8 footage. Also, when jammed, Single-8 footage has a tendency to stretch in the projector, unlike the acetate-based Super-8 film, which simply breaks. Although never as popular as Super 8, the format existed in parallel. On June 2, 2009, Fuji announced the end of Single-8 motion picture film. Tungsten balanced 200 ASA Fuji RT200N ceased to be manufactured by May 2010. Daylight balanced 25 ASA Fujichrome R25N remained available until March 2012. Fuji's in-house processing service was available until September 2013. Polaroid Polavision An instant 8 mm film released in 1977 by Polaroid, Polavision uses the same perforations as Super 8 mm film. It can be projected through a Super 8 mm projector if the film is transferred from the original cartridge to an 8 mm reel. However, because of the additive process, the picture will be much darker. Double Super 8 Double Super 8 film (commonly abbreviated as DS8 or DS 8) is a 16 mm wide film but has Super 8 size sprockets. Double Super 8 for amateurs In amateur DS8 cameras, the film is used in the same way as standard 8 mm film in that the film is run through the camera twice, exposing one side on each pass. During processing, the film is split down the middle, and the two pieces spliced together to produce a single strip for projection in a Super 8 projector. The advantages of this system are the possibility of higher frame rates and rewinding film for double exposures or crossfades, which were very difficult or impossible with the super 8 film cartridges but possible with cameras using film spools. Since the film doesn't follow a diagonal path through the stacked spools of the super 8 cassette, the pin-registration of DS8 is considered to be superior to that of Super 8 film, and so picture stability is better. Also, camera manufacturers could use models already in production for double 8 mm film by enlarging the gate and slightly modifying