When is big too big?
Originally Posted by wikipedia
The Canon EF 1200mm f/5.6L lens is a professional EF lens made by Canon that was introduced in 1993, six years after the launch of EOS cameras, and discontinued in 2005. The initial price for this lens was US$89,579. It weighs more than 36 pounds (16 kg), comes with its own heavy-duty tripod and case, and was built only by request. The focal length can be increased to 1700 mm f/8 or 2400 mm f/11 using the Canon EF Extenders 1.4× and 2× respectively. There are believed to be around a dozen of the EF 1200 mm lenses in existence. Sports Illustrated magazine owns two of them, as does Canon Professional Services and James Jannard, the billionaire founder of Oakley.
Lens construction: 13 elements in 10 groups (protective glass and drop-in filter included)
Diagonal angle of view: 2°-5°
Focus adjustment: Inner focusing system with USM
Closest focusing distance: 14m / 46ft
Filter size: 48mm rear drop in
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