Of course do I know DS-8. The thing with that format is the relative scarcity of cameras.
There are the following makes:
Meopta Admira 8 G 2 Supra, 1966
Elmo C-300, 1966
Pathé WEBO M DS-8, 1966
Krasnogorsk Quarz M, 1968
Arriflex DS-8, 1970
Canon Zoom DS-8, 1971
Krasnogorsk Zenit Quarz S-3, 1971
Lomo Aurora 2 Super, 1977
Ikonoskop A-Cam DS-8, 2007
Just to add as a sidenote about Double-Eight film cameras: the Agfa Movex Reflex of 1963 pulls through an entire roll of 25 feet length on a wind, two minutes and five seconds at speed 16 (25 × 80 frames = 2,000 frames). With a Paillard-Bolex H-8 and an electric motor you can expose a 100-ft. roll length without interruption, that would be five minutes and twenty seconds at speed 25 (latest camera model and ESM).
I have a GIC 9.5 camera and projector. I have a Beaulieu Reflex 9,5. Next projector will be a Cinéric 9½. Colorcity of Epinay responded to my request for black-and-white 9½mm film lately that they can’t find any suitable stock to convert from. Colorcity hosts an old slitter-perforator from Kodak-Chalon that belongs to the Ciné-Club 9,5 of France. I understood that it is of no use to point them to Film Ferrania’s P 30 which they would certainly be able to purchase as unperforated 35mm strips. There are more stocks on the market in 35, some with a polyester base. It takes a little mechanical knowledge and care for the equipment (which I happen to have) in order to be able to convert such, actually only a fine-grit wheel on a bench grinder to sharpen the tools. Ignorance prevails.
At the end of the 1950s you had the choice among at least a dozen film manufacturers. Eastman-Kodak, Agfa-Ansco, Agfa, Perutz, Gevaert, Konica, Fujifilm, Orwo, Pathé, Lumière, Crumière, Schleussner-Adox, Foma, Foton, Ferrania, Du Pont, 3M, Tasma, Svema, Dynacolor, Ilford, Bauchet
Made mistakes. Agfa-Ansco disappeared in 1939, the Ansco brand was continued, films made by GAF and later Eastman-Kodak. 3M entered the photographic industry in 1963 by purchase of Dynacolor, purchase of Ferrania in 1964, and purchase of Bauchet in 1966.