Grant Hamilton built this rig to shoot the image on the viewfinder of his Kodak Duaflex. This is genius and pisses on all other efforts I’ve seen, my own included. He’s making some beautiful images with it, too!
He writes:
See the notes above [on the Flickr photo page] for a parts list. I used a Dremel tool to carve some slots in the side of the junction box to accept the film winding knob and neck strap anchors of the Duaflex. I also carved an opening in the front so the lens is unobstructed. The PVC pipe fits into the junction box with friction and the downspout sleeve is rubber and is fricition fit as well. I painted the whole thing with flat black paint and used varying thicknesses of adhesive furniture sliders inside the junction box so that the Duaflex is snug. There is a large gasket inside the tube, just above the junction box on the inside to prevent light leaks. The hardest bit to get is the PVC pipe because it is sold in 10 foot lengths. I scavenged mine from a construction site dumpster. See the gouges in the pipe? I wasn’t crazy enough to want to Bondo it to make it smooth. The other parts I bought for around $15.
More viewfinder photography in the Through The Viewfinder and Ground Glass groups on Flickr.