New Nikon D750:
Lightroom 5.6 does not recognize nef (RAW) image files generated with the new Nikon D750: who can help here or knows what to do? Thanks, Peter
LR 5.6 doesn't support the new Nikon D750. You have to wait to the next update.
You con also install the release candidate of the DNG converter and convert your NEF files to dng.
http://blogs.adobe.com/lightroomjournal/2014/10/1366.html
Axel