Yes you can use your DSLR as a +500g (without the lens, or the mic, or the cage) dongle. There is a huge list of problems with this approach but it boils down

Yes you can use your DSLR as a +500g (without the lens, or the mic, or the cage) dongle. There is a huge list of problems with this approach but it boils down to the simple truism that, for pros, ports are good and dongles are bad.