Title: Makes a 70-200 f/2.8L lens into a very disappointing lens
Review: Was expecting the reduction in aperture, but not a reduction in focus! Is so bad that after reviewing a days of shooting in Krugar park we never used the extender again. The other setup used my 70-300 IS DO USM which produced better telephoto pictures than the the 70-200 f/2.8L with the 2x extender - without the extender the reverse is true. Also for those looking for confirmation this Canon 2x extender does not work with the 70-300 DO, mechanically won't allow it due to the position of the innermost lens :( Am told a third party extender (Kenko 1.4) does work with the DO lense, which will be a much more pleasant to travel with ;)
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