Canon 70-300 mm IS USM II on Canon 80D

Started 3 months ago | Discussions thread
benjilafouine Senior Member • Posts: 2,048
Re: Canon 70-300 mm IS USM II on Canon 80D

Canon is not supposed to be able to autofocus at apertures slower than f5.6 although I have read about a few cheats. At f8 you may be just out of luck.

Example: with my 70-200 f2.8, I lose two stops when using my 2x teleconverter. At f5.6, this is supported by Canon.

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