Exakta, Exa SLRs Nikkor 6mm f/2.8 Anyone? Only US $154,254.10

[wlewisiii]

Nikon Ai 2.8/6mm Fisheye-Nikkor Auto 220� EXTREMELY RARE MUSEUM PIECES ca.1981 | eBay

It is an extraordinary opportunity to find one in this good condition. Introduced in 1972, the 2.8/6mm Fisheye-Nikkor is one of the most famous and remarkable lenses ever made. It has got a massive field of view of 220° maintaining an impressive speed of f:2.8!

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[Mos6502]

Unfortunately not in Exakta mount!
Although I already have an ISCO 24mm lens and that's as wide as I wish to go.