Near as I can tell (the manual is very confusing) when the switch is set to OFF the shutter goes to full auto mode and is affected by shooting format (FPS) and available light. With the switch set to ON then all the shutter adjustment settings become available to the user, including setting the shutter to OFF if that's what you want. With the shutter switch ON you can now choose between the four settings:
- shutter speed
- shutter angle
- extended clear scan (ECS) for shooting TV and computer monitors to stop the rolling of the picture.
- slow shutter (SLS) mode for shooting in low light.
Of course, all four shutter choices have their own individual adjustment settings. Hope this helps.
I am unfortunately stuck on a weird problem as described in the link (cannot reduce shutter speed slower than 1/60 !) I'm in PAL, and need 1/50 - very strange. Shutter speeds available are: 1/60 - 1/2000 only!