Mamiya RB67 Long Exposure System

After doing some research on taking exposures longer than 1 second with the Mamiya RB67, I was presented with two choices. The first purchasing the dual threaded cable release on Ebay for ~80$ USD (at the time of writing this) or manually moving the timer ring on the lens from “T” to “1” to close the shutter. While I was successful in employing the second strategy, the process poses a risk to successful long exposures as it requires manipulating the lens directly which could cause vibrations ruining your shot. Not to mention using a paperclip to manually activate shutter mode means that's one more thing you need to keep track of. Having the clip/paperclip attached to the lens means you don’t have to keep it in hand, which is nice.

The system I created is my attempt to streamline and minimize those risks. If you have a cable release, the clip which goes over the “mirror up” nob isn’t necessary, you can trigger the shutter/mirror up with the cable and simply use the ring to move the l