I figured that a quick and dirty way to get into the pinhole game would be to convert a film canister into a camera. So far, I have done the following: 1) Cut a square hole from an Ilford (all black) canister. 2) Using a needle, place a pinhole into an aluminum square from a can. 3) Using fine sandpaper to remove the burrs. 4) Epoxy the aluminum over the square hole and seal around the aluminum with electrical tape. 5) A flap of electrical tape will serve as a shutter. I went to Mr. Pinhole's f-stop calculator, and got a value of about f/83, which translates into an exposure time of 1/4 sec for 100 speed film. I plan on using a piece of 35 mm film, curled around the inside of the canister. This seems short for an exposure, but make sense due to the small focal distance. Should I just pull the film enough to get a longer exposure, or does 1/4 second seem do-able with the shutter above?