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Two weeks ago we published a news item on the Sigma APO 200-500mm lens, a very impressive telephoto lens with extraordinary dimensions. While updating our digital SLR lens pages with the Carl Zeiss interchangeable lens information, I came across the largest telephoto lens ever produced for civilian photographic purposes. The Zeiss Apo Sonnar T* 4/1700 was developed by Zeiss for a customer with very high demands (and deep pockets) for his long distance wildlife photography. The finished lens weighs a staggering 564 lbs or 256 kg...
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