This thread is loosely related to a query I have and that is how can I turn a Hasselblad 5xx camera into a digital pinhole camera with an Aptus or Credo back?
I know it can be done with a Phase back because they are triggered by the metal "feeler" that comes out of the rear of the body when a shot is taken to ensure the film slide is absent and they have a button you can press to turn the sensor on and off. But a Leaf back is triggered from the flash synch and that won't be present with a pinhole lens attachment.
0. Set the back to "large format"
1. Unplug the sync cable from the lens.
2. Take a ballpoint pen and hold it against the contacts of the cable sync cable, while doing this uncover the lens.
3. Prior to releasing the ball point pen recover the lens so the sensor is in darkness when you release the ball point pen.
Alternatively you can use the "old style wakeup cable" from Phase One with the Leaf back. This is part #50300131
on our estore. Same end result, but much easier mechanics (just hold the button down for the length of the shot - the very slight camera shake will be hidden by the utter lack of sharpness of the pinhole camera).
See more medium format pinhole images