Hi all! I have a 3 out of 5, and I just bought the new goal of 100-400 L IS II.

Hi all!  I have a 5 d Mark III, and I just bought the new goal of 100-400L IS II.  I have an EF 2 x III Extender, and I can't get the auto focus lens when using the Extender.  Can someone help me with this?

Using an Extender X 2 double your minimum opening.  The opening of the 100-400 is 4, 5-5, 6, so if you double it is 9-11.  The maximum of 5 d 3 can autofocus is f/8, and I think that it is only the point central (and with the firmware?  I don't remember).

Long story short, no AF with the 2 X.   With 1.4 x center point should work.

Tags: Canon Camera

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