Nikon Z 6 has a Nikon Z lens mount and currently there are 3 native lenses available for this mount.
Z 6 also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on Z 6.
Since Nikon Z 6 has a Full frame sensor, it has a focal length multiplier of 1x so lenses will provide their original focal length on Z 6.
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Nikon Z 6 Lenses with Image Stabilization
Nikon Z 6 Lenses with Weather Sealings