You guys need to drag out the ol' Fuji 617 which only gets four frames on a roll of 120 and you have to put a lens on before loading the film or you ruin your film and then you can't change the lens until you've shot your entire roll. Well, theoretically you could attempt a very awkward change in a dark bag, but, no. So basically, the procedure is to view through the independent viewfinder, mount your lens of choice - and there are four - view through the viewfinder, fine tune and focus through the groundglass back, load your film and shoot a four shot bracket then move on to the next roll. AND if you manually cock the shutter in the wrong order, and I can't remember if it's before or after advancing the film, you'll lose a frame. The joys of that camera.