NEX 7 on bracket. adapter for NEX to ISO shoe, Cable to flash, Nikon SB900 in Auto, (not ittl) but now I have the most awkward to hold, never mind to use system I have ever held!.....
So the question is, how do you make this kind of thing work? or don't you. Sure I still have my Nikon gear so that is the obvious choice. but I love this little Hot Rod Camera
Try wireless flash. Buy a Sony TTL flash, and use a 20AM as trigger or 3rd party TTL trigger such as pixel king. And you will forever be liberated from the limitation of on-camera flash.