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  • PhotoPlus : The Canon Magazine

    EOS S.O.S

    Nov 16, 2021 5 minutes
    “I’m planning to get an EOS R5 and want to know if the EF 100-400mm f/4.5-5.6L IS II USM lens and EF 2x Extender will autofocus, as it won’t on my DSLR?”
    Heather Reynolds, Machynlleth

    BRIAN SAYS… Most DSLRs require the max aperture of the lens and extender combo to be f/5.6, a few more recent models will focus with f/8 using a specific central AF points. Your combo would be f/9 to f/11, which is possible for the EOS R5 to focus with.

    When going mirrorless the image sensor is used for AF and has a greater ability to focus with slower lenses. Canon makes the RF 600mm F11 lens and it works with a 2x extender and, still, focus is possible at f/22. What’s little known is that many DSLRs used in Live View will focus lenses

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