Turns out the RAW format used on the NEX-3F is a new format and only supported in Photoshop in CS6. Adobe don't even have Camera Raw Plugins for versions lower than that.
So if I want to open those RAW files in Photoshop (I have CS5) now it means a US$199 upgrade which I don't really want to do. Plus CS6 only runs on Windows 7 with SP1 or Window 8 and I am loathe to do a major OS upgrade so I can read the new camera format.
It's annoying but not impossible since Adobe do release a standalone converter that reads most RAW formats and converts to DNG format but still, it means I can to convert all my photos before I can even view them.
Just wondering what other folks do when they change camera formats?