best lens for 1.4x extender

Started Dec 4, 2012 | Questions thread
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Dean Malencik New Member • Posts: 21
best lens for 1.4x extender

I have a 1.4x canon extender.  What would be the best lens to extend its reach--the 100-400mm canon or the 70-300mmL canon lens?  I am thinking of sharpeness and autofocus ability.

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