Mechnical things largely work the same. What you do have to pay attention to is that you can't have stuff like flywheels that rely on air to slow them down.
Otherwise, a film camera would work the same in vacuum, even if it had some electric components.
For the film itself, I don't think you need anything special, there is nothing on the material that would boil off under vacuum to my knowledge.
The difficult parts are really heat because unlike in air, any heat you gain is difficult to get rid off again since there is no air to transport it away. So if you do have some electrics in your camera they can easily overheat if not designed for vacuum operation.
> Vacuum cementing or vacuum welding is the natural process of solidifying small objects in a hard vacuum. ...
> This effect was reported to be a problem with the first American and Soviet satellites, as small moving parts would seize together. ...
> In 2009 the European Space Agency published a peer-reviewed paper detailing why cold welding is a significant issue that spacecraft designers need to carefully consider.
Regarding specifically plastic, which might be used for the film, see https://en.wikipedia.org/wiki/Corrosion_in_space : "Many plastics are considerably sensitive to atomic oxygen and ionizing radiation."
That link also points out the "material fatigue caused by cyclical heating and cooling and associated thermal expansion mechanical stresses."
As an example of cold welding. The Galileo spacecraft wasn't able to deploy its high-gain antenna because the pins that held it in place got stuck. There was graphite lubricant to prevent that but it was shaken out while it was being transported to the launch site.
Also in the early 90's saw a price list for (3M's) two part silicone products. One product was $25,000 a gallon. Application was for space craft windows. Turns out regular silicon will out gas and fog windows under hard vacuum.
All the above has lead me to have a lot of respect for the engineers that made this stuff work. Ditto because every time I've had a materials problem it's been a trail of tears.
Otherwise, a film camera would work the same in vacuum, even if it had some electric components.
For the film itself, I don't think you need anything special, there is nothing on the material that would boil off under vacuum to my knowledge.
The difficult parts are really heat because unlike in air, any heat you gain is difficult to get rid off again since there is no air to transport it away. So if you do have some electrics in your camera they can easily overheat if not designed for vacuum operation.