Originally posted by tim60 I have a Ricoh bellows. The back mount is on a fixed structure, and I have been able to mount it on both K100DS and K3 with not problem. Try moving the rear mount to the back of the rack.
The problem is the moving rear standard which if you look closely protrudes backward farther than the body-mounting surface. You remove the body-mount ring, bayonet it onto the camera body, then attempt to re-insert in the rear standard, but the baseplate region of the camera bumps against the geared support of the rear standard because the latter projects backward slightly. It's one of several annoying things about devices designed in the LX era when using them on a modern DSLR. For example, I cannot rotate a Pentax digital camera to vertical orientation on the bellows because the overhanging prism/pop-up flash or the hand-grip interfere. I also cannot rotate to vertical on my 200mm SMCA macro because the prism/pop-up flash overhang strikes the locking knob on the tripod collar. Because the lens is used exclusively for close-up/macro, I've sometimes added a short extension tube before leaving the house so I can rotate to vertical if the need arises.