Hello, My lightroom does not regnonize the new NEF(RAW of Nikon) of my new photo camera, but the old (Nikon D700) are ok (sorry for my english). What can I do??
You will either have to upgrade to the current version of Lightroom or downloaded and used the current version of the DNG converter to create DNG copies that you can open in the Lightroom that you have.
In reality, your camera was first supported in Lightroom 5.7. Adobe does not sell that version anymore. And if you're going to upgrade you might as well upgrade to the current version.
Either update to Lightroom 6 (you could use Lr 5.7, but it's no longer available from Adobe); or download and use the free Adobe DNG Converter - Lr 3 will read D750 NEFs converted to DNG.
Thank you very much I have taken DNG converter... just for now its ok!