This is the Nikon NIKKOR Z 26mm f/2.8 lens. I attached it once after purchase, but it has been stored in a dry cabinet without use. The lens cap and lens hood are also included, and it is practically new. The size information only listed Nikon F-mount, so it is listed as F-mount, but it is actually a Z-mount. Focal length: 19-70mm Maximum aperture: f/2.1-2.8