well, i have a Cambo monorail, a Polaroid 405 and a Problem ... the Polaroid 405 doesn't fit on the back of my Cambo! it's too wide! i mean, OK, it doesn't fit under the groundglass, which i expected. it's too thick and the groundglass doesn't open far enough. but worse is that the Polaroid back is wider then the opening where it should insert. i had no idea this was going to be a problem, since i thought all these sizes were standard. does anybody also encountered this problem? and so, how can it be solved? i'll post some pictures of camera and back soon. thanks, maarten.