This is a clean Samyang 8mm F3.5 fish-eye lens with a Nikon mount. It is manual focus only and has an aperture ring for manual adjustment.
With relevant adapter it will cover up to APSC sized sensors including Sony FS7, FS5, FS100/700, Canon C100/300 any micro four thirds camera. Depending on the type of adapter used, there is an aperture lever that will offer a smooth manual adjustment on the fly(via Novoflex/Commlite/Viltrox etc).
On my Lumix GH5 with Novoflex adapter it gives approximate equivalent field of view to a 16mm full frame lens & I can rack iris smoothly. It is quite stubby which helps reduce stress on gimbal motors.
Due to the wide angle (180 degree equivalent), it is not possible to attach filters to the front element.
This vendor was most helpful, I highly recommend him
I had some difficulties my side of the transaction and the seller was super patient with me even though they had another buyer waiting. BB List staff very helpful too as it was my first use of the service. Very Satisfied.