David,
I don't know just yet, but I will try removing it tomorrow.
What I can see is that it is attached to the camera body via a flange and the aperture ring appears to set right down on the flange, so I doubt it will allow shortening, but I won't know for sure until I take it apart.
The lens does not want to unscrew and I can't find a release, so I don't want to break it.
I cannot see if the flange is threaded or a bayonet of some kind.
The lens says its made in Japan and feels very solid.