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Message: <blockquote data-quote="amilne" data-source="post: 1169395" data-attributes="member: 1156">Thanks very much for all the helpful information. I suppose the lack of comments from 400mm DO owners is just that there are not many out there. I have found a gallery of photographs for the lens, with and without a 1.4 extender here <a href="http://www.pbase.com/omar_brannstrom/canon_400mm_do_f4_test_gallery&page=1" target="_blank">http://www.pbase.com/omar_brannstrom/canon_400mm_do_f4_test_gallery&page=1</a> which I think shows that someone can get results with the lens when photographing birds. The sheer lightness makes me think that I will have to go for the DO lens, and probably follow up with a longer prime at some stage, if I don't sell it again first when I find out why no-one else has one.  :'DAlex</blockquote>