Title: READ THE FINE PRINT
Review: I recently purchased the canon 100-400mm L series with auto focus and image stabilazation. Amazon had the extender come up as a recommended buy. The problem is that the extender requires a lens with a 2.8 f stop for the auto focus to work. I tried using the extender withou the auto focus and found it almost impossible to get a clear picture. I'm sure the extender would work well with any of the canon $7000-$10,000 professional telephoto lenes, but not with the 100-400 L series zoom.
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