Canon EF 400mm f/5.6 L USM Reviews
Aug 22nd, 2006phen
ultra sharp even wide open at f5.6 and high contrast, lite wt, built solid.
Feb 10th, 2009samir
Superb lens for astrophotography and birding. Very light, very sharp wide-open. For a full comparo against a premium astroimaging APO of similar aperture but costing significantly more:
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