"Camera held against the side of the shed and pointed up into the tree. A guesstimated exposure of 2 seconds. Ilford HP5+ rated at 400ASA"
"Illy coffee tin with a 0.8mm pinhole punched in the side, giving an aperture of around f/100
The 'shutter' is formed from a piece of flexible magnetic strip shaped to the curvature of the tin. It's slid away from the pinhole to expose the film and back over the pinhole at the end of the exposure."