6×7 camera

This is a shot of my homemade 6×7 pinhole camera.  With a recycled Mamiya RB67 back, it takes 120 film.  It has a precision micro-drilled pinhole.  The rest is cardboard and gaffer tape.  Although I do have 35mm pinhole cameras I prefer to use those that take 120, 5×4 or 10×8 film as they make much better contact prints or scans.  I use precision drilled pinholes because once you know the diameter of the pinhole, you can work out the optimum focal length of your camera, and from that the f-number.  Thus accurate exposures can be calculated.  This is the camera I used to take the images of the viaduct and railway bridge – see Image Gallery.