I originally posted about that lens here:
https://nikongear.net/revival/index.php?topic=8838.0 This was in 2019. I have since graduated and found a job.
Through some luck, I got a copy for AUD 2000. It had some fungus spots. Our local Nikon service centre determined that the fungus was growing inside a cemented doublet (the large front element).

The repair quote was $3700. :'( The fungus was not too bad so I am just going to use it as is.
Look at how massive this thing is.

It is just barely within my hand-holding limits after my left arm had to undergo surgery.
The focusing is incredibly fast and accurate on my Z8. It feels way faster and a lot more accurate than my 500mm PF.
I tried it with the TC800-1.25E ED, no loss in image quality or AF speed was observed. Image quality loss with a 2x TC is noticeable but acceptable. AF is still fast, it still feels faster than my 500mm PF. I might sell both of my PF lenses because of this acquisition.
Here are some photos I took. It works so well for wildlife where the surrounding environment can be incorporated into the shot.
(All wide open.)





With the 2x TC.


I love the results. Even messy backgrounds melt away. This makes me want to get the 400mm F2.8 TC or the upcoming Z-mount 120-300mm which no doubt has a TC built-in too.