Correct! The Canonet, works in full manual. Selecting shutter speed and aperture with the two rings in accordance with any metering - machine or guestimated.
There is no need to touch anything on the ISO setting as this only effects the meter sensitivity, which is not active without a battery. It is the Canonet's electronics that are ISO limited to 800, and not the lens or shutter, thus you can shoot ISO3200 with appropriate manual settings.
I would start with the Canonet, and enjoy its near perfect configuration, before moving onto an interchangeable lens RF. As I did.
For the money though, the Canonet will give you near Leica performance for nothing like the price. Bessa too are near as good...
Results regardless please! See ya. Skj.