Mounting the Entaniya Fisheye on the Nikon Z9
The Nizkon Z9 is a Nikon camera and uses the Z mount.
The Entaniya Fisheye HAL series is not Nikon Z-mount and cannot be attached as is.
However, the lens can be attached via a mount conversion adapter.
Mounting adapter to Z-mount
For EF mount lenses
Lenses
HAL 250 EF 4.3 / HAL 250 EF 6.0 / HAL 200 EF 6.0
Mount conversion adapter EF-Z (a type without electronic contacts is recommended)
K&F Concept KF-EFZ
SHOTEN CEF-NZ
For PL mount lenses
Lenses
HAL 220 PL / HAL 220 LF
Mount conversion adapter PL-Z (a type without electronic contacts is recommended)
Metabones MBPL-NZ-BT1
Wooden Camera 269000
KIPON PL-NIK Z
MTF Services MTPLNIKZ