Does Fanotec offer a Lens Ring Clamp and Plastic insert for this lens?
Samyang 8mm f/2.8 Fisheye II Lens for Fujifilm X Mount
If the 180 degree diagonal is rotated to vertical, how many degrees up is required to close the zenith?

I am also considering a pole. If I shoot the zenith separately, how many degrees down is required to minimize the nadir hole? This will help me decide between an R1 or R10.

Any advice is appreciated.