I'm having some issues using one of these to actuate a 6008 mount lens in the appropriate Rollei adapter.

Using the open shutter button, the shutter opens fully, as it should, however the shutter close button will not fully close the shutter; instead it stays open at about f16 or so.

regardless, I can still actuate the shutter with the S-control shutter button, but it returns to the partial open condition.

changed batteries, re-charged them overnight, same problem.

this system is used and new to me.