I have the Hartblei 45mm super rotator for my Pentax 645 outfit. The only reason this stays is for portability - as all the Fuji 680 lenses can be tilted and shifted on the 680 bodies (apart from the 680 IIIS body - mostly designed for the 100-200mm zoom and the heavier telephoto lenses to lessen torque from the weight of all that glass).

The Hartblei is very nicely made and feels solid, yet fluid in movements and focusing. A really nice piece of glass. And with an adapter it works with my Nikon F mount camera bodies.