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I had both a 1.4x and 2x extender. Sold the 2x because it does degrade image quality a bit. Still have the 1.4x but rarely gets used. I have the 100-400 and although I can use the 1.4x on it, autofocus won't work because effective max aperture is greater than f/5.6 with it on. If you're into wildlife I'd lean towards the 100-400 over 70-200 with extender.
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