Last updated (29 July’10):
– Review by Luminous-landscape
The Canon EF 400mm f/4 DO IS USM features 400mm at focal length with maximum aperture of f/4. The lens construction has 17 elements in 13 groups and has diagonal angle of view at 6.2 degrees. Focus adjustment: Inner focusing system with USM, Closest focusing distance at 3.5m/11.5 ft and has a filter size of 52mm. The Canon EF 400mm f/4 DO IS USM lens weighs 4.2 pounds and it measures 5 inches in diameter and 9 inches long.
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