Falling into the interesting photo experiments category, Patrick Letourneau adapted a Kodak Aero Ektar 178mm F2.5 lens, a surplus lens originally used during World War II in bomber-mounted cameras, to use with his Panasonic GH2. A Thorium-oxide coating was used on the Aero Ektar's rear element to improve its refraction index, a fact that adds a sense of intrigue to the unique project. 

Weighing about 3.2 pounds (1.45kg), the Kodak Aero Ektar was made in the early 1940s
The Up! 3D printer allows quick prototyping of custom parts without machining

Letourneau used an Up! Personal Portable 3D Printer to construct a lens mount and bracket, which he said was accurate to within 200 microns, then used an old bellows and some scraps to build a light-tight enclosure, employing an LCD diffuser to serve as a ground glass focusing screen. Though use of a 3D printer makes this project novel, modifying cameras to accept Kodak Aero Ektar lenses is not without precedent.

He focuses onto the ground glass using the rail and bellows
Then photographs the ground glass with the Panasonic GH2

The resulting images have a unique look and a built-in, vintage vignette. (Images below link to Letourneau's original post.)

You can see Letourneau's Building the Bomber Cam with 3D printing and scraps on his blog, PolygonSandwich.com

Via PetaPixel