Extreme fisheye lens from Nikon?

So, I've been looking in to fisheye lens, and there's the 10.5mm from Nikon currently, but I was wanting something more…

But I was looking into the <10mm fisheye lens, and they are all $900+ and I don't have that kind of money.

So I was looking at the older Film SLR lens from Nikon.

Here is what I've found:
6mm:
http://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/6070nikkor/fisheyes/6mm56.htm

7.5mm:
http://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/6070nikkor/fisheyes/75mm56.htm

8mm (but sadly f/8… ):
http://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/6070nikkor/fisheyes/rjohnson/8mmfish.htm

My question is, can I use these with my Nikon D200? Can I get mount converters?

I can't follow the links as the domain comes up as forbidden for me…

But as I remember the size of the rear of the lenses will hit the mirror of an DSLR. If you have the mirror raised (mirror lock-up) they will fit the camera body, but of course you then can't use the viewfinder. And if the mirror should flip you will smash it. It's risky but could be used. Careful use and use of mirror lock-up will mean you could use them but I don't know, seems a lot of effort.

Be careful the mirror will hit the edge of the glass on some of these old lenses, instant return mirrors uses to bit shorter than is current design and some old fisheyes were designed to mount only after the mirror was raised, you would use an auxiliary viewfinder to compose.

Only the early versions of the Nikon 6mm have a protruding rear element needing mirror lock-up. The viewfinder is unnecessary when everything in front of and some areas behind the lense are in the picture! Later versions from (I think) about 1972 were a redesign and could be used without locking up the mirror.
Both versions were rare and ferociously expensive!