Can someone with a 9x12 Patent Etui please post a photo of it with the back off and the bellows closed? How high up from the lens board does the rear lens sit? And odd request, maybe, but I have a suspicion my rear lens element doesn't match my front! Two things lead me to this. First, when the bellows is extended to the infinity stop on the camera bed, the lens isn't focussed at infinity. I have to extend the bellows another centimetre or so. Maybe this is normal but I suspect not. There are a couple of screws on the distance scale which look like they allow it to be adjusted slightly. But there certainly isn't room to adjust it by a centimetre, only by a few mm. Secondly, when the camera is closed, the rear lens sticks up some way, so that I can't easily remove the focussing back without it hitting the lens rim. I have to open the camera bed so that the lens moves forwards slightly. The back isn't original to the camera but I don't think that's why it hits the lens. And it has an old acrylic focussing screen which seems to rest, when the camera is closed, right up against the rear lens. I'm planning to fit a ground glass in there instead but worry the lens might crack it! My lens is a Rodenstock Trinar 135mm, f4.5 in a Compur shutter. At least, the front element is labelled as a trinar. As I say, I'm suspicious of the rear element. Seeing another KW may help resolve this (although if it is fitted with a different lens, it may not!). Seeing a different camera, but one fitted with this lens, might also help. PS. - Another thought - could it be that the lens is fine (front and rear elements match) but that the lens/shutter combination isn't original to the camera?