Good one Joe.
To surprise you, I still take picture with my DCS NC2000e Kodak/Nikon based DSLR that uses Nikon N90s body (Not F3), very similar to the one on your mir link.
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Here is probably the most expensive piece of glass you can ever buy (Price divided by weight or size of what you get), or almost;
It is a converter that on early dates of Canon switching from FD / FL mount lenses to EOS, was used to keep the heavily invested professional photographers on expensive long focal length lens, happy with transition thus enabling them to use old expensive lens, on new camera bodies (Still film base camera bodies).
Ebay LINK
Canon has long stopped making them and I believe only 1 to 2 thousand of them were ever produced. There are cheaper Chinese version now a days too, but due to typically low quality glass used, they reduce the IQ significantly as opposed to real Canon deal that makes no noticeable change in IQ when used on long length old FD Canon's lenses.