I want to upgrade the 127mm Ysarex on my Polaroid 110B, it has been converted to 6x12 roll film. Are there any lens/shutter combos out there that will fit and still allow the camera to be folded shut? Any lenses suggested must be better (sharper) than the Ysarex and should be relatively close to 127mm so that the rangefinder can be accurately adjusted. If the proposed lens is really good I will use it if the shutter and rear cell can remain in place with the camera folded. The front cell can be carried in a pouch separately and screwed into position (with a hood) when needed. I appreciate your suggestions.