[Klaus]

https://tokinalens.com/product/szx_super...reflex_mf/

Renaissance of the slow lenses it seems ;-)
I'm fairly tempted to take this one for a ride. It has been a while since my last encounter with a mirror lens (the Tokina 500mm f/8 I believe).

[Rover]

Maybe you mean this one.
https://opticallimits.com/nikon--nikkor-aps-c-lens-tests/286-tamron-500mm-f8-sp-macro-adaptall-to-nikon-review--test-report
Time flies.

[Klaus]

Ah yes, something with a T ;-)

[toni-a]

Could it be a rebadged kenko 400mmf8?

[Rover]

Since the company is actually called Kenko Tokina... there's a solid chance.

[Brightcolours]

You are right, Toni. The "tokina" is exactly the same lens as the existing Kenko.

[mst]

They still build these things? I almost choked on my donut when I read the headline...

[photonius]

Ah, time to look in the closet and dig out some old lenses.... ;-).