I put my Nikon 100mm f2.8 on an adapter and can't get the shutter to trip. Haven't found a menu item that sets MF as opposed to AF. It does say MF on screen I guess by default. Could the adapter be faulty? I've never had this happen on any other mirrorless. Am I missing a secret setting of some sort. I find nothing in manual or menus relating to this. Getting the adapter to seat properly was tricky but it finally clicked.