The lens is made for 2/3″ sensor ENG and studio cameras; however, Fotodiox makes a handy little B4 to Micro Four Thirds mount adapter. When you use the adapter coupled with the 2.6x extender feature of the GH4, then you can cover the active sensor area with the smaller image circle.
Stacking the 2.6x extender on top of the Micro Four Thirds 2x crop factor gives you a massive reach with this lens.
It’s pretty crazy that it gives you a wide scene like this:
And then it can zoom all the way in to the tiny little light house in the center of the frame for this shot:
[via 43 Rumors]