So i have this lens, and i want to use it to close to its full potential. I dont do film, and just placing it in front of my GH2's cropped sensor would make it a super telephoto, so instead i decide to built a focus adapter.

Bust out the 3d printer

So i decide on a ground-glass style adapter, only i cant find frosted glass fine enough to resolve a lot of detail. What i end up using was the diffuser from an old LCD I had. Diffusers are super fine-frosted sheets of plastic that spread out and even out the backlight on your monitor. I cut a piece to size and knew i had to build a housing for it. I started off with a pair of aluminium square tubes, as knew i wanted to build an adapter that could host my digital camera. The lens would throw onto a ground plane, and the camera would photograph the flipped image from the diffuser. Luckily, i have access to an Up! Personal Portable 3D Printer. I started measuring the lens and designing a support bracket in Cinema 4D