Currently I am trying James Millar's method of transferring old Super 8 movies by DSLR 1080p video of film in projector gate: https://vimeo.com/20950590 With projector lens still in place, Canon DSLR T6i (no lens) close to projector lens, I can get sharp image of tiny movie frame 6mm x 4mm in gate, lit from desk-lamp behind gate. However, I would appreciate input re best settings on Canon 6Ti?
Yes, it's typically possible to take pictures with no lens attached. You can even make a digital pinhole camera by having a lens cap with extremely small hole in it!
The camera knows there is no attached lens, so it may omit the picture in the live view mode and replace it with a dark image.
Note if you're using external optics (projector lens), you need the image to be in focus at the sensor. Not sure how easy that's to achieve with the projector lens.