This is a Canon 1200mm f5.6 lens that B&H sells for $120,000. You can also use it with a teleconverter to reach a 2400mm focal length.
The story the tell about it is pretty interesting:
The predecessor to the Canon EF 1200mm f/5.6 L USM Lens was the Canon FD 1200mm f/5.6 L manual focus lens. The FD 1200 was first seen at the 1984 Olympic Games in Los Angeles, CA, USA. Chuck Westfall of Canon USA was there and remembers that "5 copies of the original FD 1200mm f/5.6 L lens were brought to L.A. and used for newspaper, magazine and wire service coverage of the Olympic Games."
Mr. Westfall indicated that "All of the FD mount 1200mm f/5.6L lenses were eventually shipped back to Japan, and at some point in the late 1980s, they were converted to EF mount" resulting in the lens model I am reviewing here - the Canon EF 1200mm f/5.6 L USM Lens. The new EF 1200 was then marketed by Canon in July, 1993 with an annual production volume of around 2 (that's right - "two") lenses. The EF 1200 L was available by special order with lead times running about 18 months.
Why such a long lead time? For one reason, it takes nearly a year to grow fluorite crystals large enough to be ground and polished for use in this lens. In addition, the lens is "virtually hand-made".
According to Mr. Westfall, "Canon has not released specific production quantities, but according to my understanding, less than 100 of these lenses were made." Rumors put this number closer to 20, but ... no one who knows is releasing the actual figure.
There are more picture of it and taken from it in the article on the B&H site. There's also a short video about it.
I don't think it would work with my Pentax, but this is the kind of lens you buy a camera for -- not the other way around. I'd probably need a different case for it too. And a new tripod.
Ah well. Not worth the hassle I guess.