I use my 90mm on my Zone VI, and I seem to remember the literature at the time saying you could use shorter lenses. As JMCD said above, you have to raise the front standard, tilt it back using the base tilt, and then level the lensboard with the axis tilt. It is not the easiest or most graceful of operations, but it works. I use the bag bellows for my shorter lenses, often including my 150mm.

Peter Gomena