Electric Stereo Pinhole Board

This ultra-deluxe electronic lensboard transforms your Stereo 12 into the most advanced pinhole camera ever devised.  It plugs into your lensboard port like any standard lensboard, but requires no additional shutters.  Electronic shutters are built-in and will operate on Bulb mode when directly plugged into the Stereo 12. This board features two selectable pinhole apertures: 0.3mm for an equivalent 50mm field of view (f/168), and 0.35mm for an equivalent 70mm field of view (f/200).  You can instantly switch between the two different apertures via two sliders on the back of the board.  These sliders are readily accessible with the board off the camera, or mounted on the camera with the film back removed.  The 50mm pinhole setting should be used with no spacer, directly mounted to the front of the camera.  The 70mm pinhole setting should be used with a Base 20 spacer. This board is compatible with the Mercury Shutter Timer.  When used with a Stereo 12 and the Shutter Timer, you can selec