Though it looks like it could blow a hole through a steel door, what you're looking at is a 400mm picture camera from Leica. Dubbed the Leica Gun, it's part of a rare camera auction taking place on January 28th through Tamarkin Photographica and eBay Live Auctions. While it looks like it can scare the pants off of the meanest DSLR out there, I can't imagine you'd have much luck getting your subjects to sit still when shooting with it.
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