Turn the camera over. There's a little button on the bottom somewhere. It releases the gears in the takeup spool; push it and you can rewind the film with the film crank. Once the film's completely rewound into the cassette, pull up the rewind crank and the back opens.
This is how film is removed from any manual-focus 35mm camera.
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By taking it out!! :L
Exposing the film to light may have caused the film to come out blank.
Either expose the remaining film or, in a perfectly dark room (or a "dark room" lighted only with red light), advance the film and work the shutter as if taking photos or open the camera, remove the film and manually roll the film onto the take-up roll. If you do any of these things in a dark room or "dark room," the film will not be exposed but, unless you have photographer's equipment and skills, you will not be able to use the unexposed portion.
I believe he uses a Pentax for studio work but i am not sure of the model...that's all I got. when he shot film, he was shooting a Pentax 645n or an nii, nowadays i think he's pretty much only doing stuff that he wants to (a lot of gallery work) and uses digital Hasselblads, with I'm sure, the highest resolution backs. along a bajillion studio lights, ringlights and beauty dishes and whatnot
A Leica film camera