First thing you need to do is find out if your camera connects to the tablet like a drive. Plug it in (you may need to manually put your tablet into host mode) and see if you get the file manager. If not, then you're going to need gphoto2, and things get a lot more complicated.



EDIT: The central problem with RAW photos and the tablet is that they tend to be HUGE and can be very difficult for a limited-resource device like the tablet to process.