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Old Feb 25, 2007, 7:12 AM   #31
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Thanks, that explains a lot
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Old Mar 1, 2007, 4:41 PM   #32
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I'm considering getting a 1.4x extender/teleconverter for the canon ef 300mm f4 IS USM. Is there any difference in image quality or autofocus speedbetween sigma apo dg, kenko, and canon?
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Old Mar 1, 2007, 6:38 PM   #33
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I have the canon 1.4x and love it on the 70-200L IS f.4...and am planning to get the 300mm...Donna
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