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- Joe
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What is the difference between these two extenders apart from the incredible price difference?
Difference between 1.4x convertor or 1.4xIII
- Thread starter FreeloaderJoe
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- Luke
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If you mean the difference between II and III, the two commonly available at the moment, III has new coating which reduces flare and ghosting in images, and a newer chip that enables IS to work better with newer IS systems in Canon's latest lenses.
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- Richard
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Mk3 extenders are completely different in every respect. And better 
Reviews here http://www.the-digital-picture.com/Reviews/Canon-Extender-EF-1.4x-III-Review.aspx
Reviews here http://www.the-digital-picture.com/Reviews/Canon-Extender-EF-1.4x-III-Review.aspx