So I have finally got around to looking at my new purchase, an arca swiss 5 4, the thing is I cannot work out how to open the lens shutter, tried everything and looked at other lens which have a little lever that open and close it but this one as far as I can see only has the following.
Lever to coc the shutter
lever to fire
shutter speed lever
the one lever which has M X and V,Which I believe to be M bold flash/ manual, X electronic flash and V is a timer.
Please help if you can as if I cant open to focus its not much use to anyone.