Canon 1.4x and 2x Extenders III

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Agazir New Member • Posts: 3
Canon 1.4x and 2x Extenders III

I was going to purchase a Canon extender 2x III, but saw several negative feedback about it not working for auto focus.I'm looking at using it on a Canon 7D MII with a Canon 100-400mm II, used for bird photography.

I queried this with B&H Photo staff and they confirm that the extender will only work with v1 of my lens.
I'm completely puzzled by this.

I'd love feedback from folks that have used extenders with the camera and lens I'm using. Wasted money? Or Worth it despite it all? Pros and cons?
Any feedback appreciated.

Canon EOS 7D
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