The pinhole camera: Focal Length (for 4x5 sheet film): 98mm
Pinhole Size: 0.22mm
Field of View: ~110degrees horizontal
Pinhole Aperture: f/445
Format, 4x10, 5x10, 4x5. etc..
The total cost:
Box for camera: Free, found around the house
Lens: Free, made from coke can
Paper Developer: $4.95 (enough for over 200 pictures)
Rapid Fixer: $4.95 (enough for over 200 pictures)
3 large plastic trays. Free, found around the house.
1 Safelight bulb. $12 at a photography shop.
Paper (or film): $15 for 25 8x10 sheets of . Enough for 50 4x10" inch photos.
This one is mine. As you can see it is made out of a Smashing Pumpkins - Aeroplane Flies High box set. This box is very ridged and has 2 layers of thick cardboard on the walls, the lid has only 1 layer of cardboard. Surrounding the cardboard seems to be a plastic vinyl material. The lid is hinged.