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Message: <blockquote data-quote="Chris B." data-source="post: 1865005" data-attributes="member: 59376"><p>I don't use any Series 1 bodies... the "DO" virtually lives on my 7D with the 1.4x and I also have a 40D.  I do have a 2x but can only use it with manual focus, and I've never tried stacking the 1.4 with the 2x because the viewfinder gets very dark, and I'm not a big fan of "Live View". I try and shoot as close to f7.1 as possible because the diffraction index on the 7D is f6.8. This is a shot made with the DO and the 2x, and it holds up ok...</p></blockquote><p></p>