We're playing tag with this information ... and it originated in Spain with ...
If you can read Spanish ... this is the place for you. It's pretty amazing what those Europeans get their hands on, before us.
OK ... if it is "OVF" or Optical View Finder ... then it probably directly controls the mirror flip and would be in an excellent location to do that. I as much in the dark as anyone on this. Worst part ... I could care less ... I want the α900 and the full-size lens releases.