This giant 5200mm lens from Canon is probably one of the biggest camera lenses ever made (it was built in the early 1960s). The 100kg lens is capable of taking photos of object 18-32 miles away (see below). If you are wondering where the camera is - it's the tiny object on the right of the image.
This site has more images of the lens including some of one that was being sold by a Chinese company. [via]
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