What will happen if I open a camera with film in it?

I have an old canon eos 850 and I opened the back of it while there was film in it. Someone told me it would ruin all the film because light got into it. Is there anything wrong with opening it while there is film?|||Film is light sensitive - what exactly do you think might happen??





If the film is out of the cannister then any frames which are not wound onto the take up spool with be totally ruined. any film wound (tightly) onto the take up spool will suffer from excessive exposure at the edges but the further into the reel they are then the less they will be affected.|||If the film hasn't been rewound, it will overexpose the film. All the frames will be white. Sometimes you can salvage some of the photos on the end that is already rolled, but it's hit or miss.|||You'll ruin the film. Hopefully you rolled the film to the end before you opened it. If not, that film is ruined.|||The film that is exposed to light will be ruined. Any photos taken and rewound inside the canister may be ok.