From the Lensless Camera Mfg. Co. No need to load these cameras in the darkroom: simply use cut film holders or Polaroid backs like those used with lensed cameras. If you prefer, do it the traditional way, load the film in the darkroom using the back that comes with the camera. The standard camera is made from 1/2 in. 9-ply Baltic Birch plywood, walnut stained with a polyurethane finish, with vertical and horizontal tripod mounts. Using 4 in. x 5 in. format 400 ISO film or #52 Polaroid, exposure time in bright noon-day sun is about 4 seconds.
Other sizes, wood finishes and formats available.