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Title: Poor copy
Review: I received a poor copy of the 300mm f/4 from Amazon.com. Unsharp at all apertures, and a ton of chromatic aberrations, even at f/8. Obviously there was something wrong with the optics. Could have been a bad copy from Canon, could have been Amazon's terrible packaging. Either way, it cost me $30 to insure/ship/return the faulty lens to Amazon!
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