Re: Canon 1.4x EF Extender II vs. III In reply to mrjayd • Feb 4, 2011 They said it has some kind of new coating which reduces ghosting and flare and also a chip with new electronics to improve the focusing when use with the newer generation IS and all those new big telephoto lenses, so it's all good on paper.
I'm using the 100-400L USM IS II, the Extender 1.4X III, and the EF-RF Control Ring Adapter on my R5, which gives an equivalent 140-560mm zoom range. Of course the added lengths of the extender and adapter add to the overall length, but it's definitely a usable combination.
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