I've recently brought an A7ii and Techart Pro. During testing this combination works well with my lenses much of the time, but it's gone through periods of failing to even try focusing (taking a picture with a severely out of focus image), and sometimes even failing to show anything in the viewfinder! Any ideas on where the issue might lie? Is it the camera, the techart, or the user??? I don't have any native lenses having been using adapted lenses on a Nex6 since christmas & on the A7ii for only the last couple of days. In that time I haven't seen the blank screen on either body when just using manually adapted lens on this camera. Powering the camera off & rebooting it has not always cleared the blank screen, but does seem to restore operations eventually. None of my local friends who're into photography have yet gone for e-mount, though between members of the workshop we have most other options covered.