£15k anyone Sigma APO 200-500mm F2.8/400-1000mm EX DG

It's been out for a fair few years now...
 
Very impressive lens, just a tad impractical if you ask me (not that I've ever used one)

I'm very tempted by their 50-500 offerings though.
 
Ok then how about
lenses_canon_5200.jpg

Canon 5200mm F/14 Mirror Lens
Using a group of mirrors and a housing that's almost big enough to use as a coffin, Canon was able to stretch the focal-length on this SLR-specific lens to 5,150mm. Just how long does that make it? The original Canon info sheet claims its best used for photographing obects 18 to 32 miles away. In fact, in order for it tobe able to focus at all, your subject will have to be at least 120 meters (~394 feet) away.

Even with the mirrors to help keep things compact (at least compared to the previously mentioned 1,700mm Zeiss), the total package still weighs 220-pounds without the solid metal stand on which it's intended to sit. The rest of the measurements are just as impressive, including its 20-inch height, 24-inch width and its massive 75.6-inch length. one went up on ebay and sold for almost$50,000.
 
its medium format too, so you could stack speedboosters and get it to be f2 or so :)
 
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