NiSi is expected to announce a new fast (f/2.x) wide-angle ASPH lens for Nikon Z-mount at the end of September (you can subscribe for email notifications on their website). This will be the second NiSi lens for Nikon Z-mount – a few months ago they announced a 15mm f/4 ASPH lens (currently in stock). Here are the first leaked pictures of the new lens:
More third-party lenses for Nikon Z-mount can be found here.
It is good to see that Nikon is not giving hard time to third-party manufacturers like Canon.
Via PhotoRumors