There are 3 cables into the camera
1. DC power supply
2. USB for normal camera control and picture download
3. USB into the ShoeString converter which send a 3 strand wire cable ending in a 2.5mm jack which into the Bulb jack
So yes its seperate. But the problem seems to be once shutter release is triggered, the camera defaults to closing via the last shutter setting - ignore the bulb timer which continues to run, but the camera has already (incorrectly) received the shutter close command elsewhere!
What am I likely doing wrong please?
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