Hello! I bought an adapter for an old Zuiko 50 1.4 lens and want to use it on my Sony a850. The adapter mounts fine. There are no electrical contacts so the camera thinks there is no lens attached and will not fire the shutter. I can not find out how to disable/enable that function in the menu settings. I read on internet blogs that it is easily done with other Sony cameras. Perhaps this can not be done on the new a850? thanks -rob