Tamron 100-400mm and Canon extender 1.4x II

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Pascallee New Member • Posts: 20
Tamron 100-400mm and Canon extender 1.4x II

I have the 100-400mm and thinking of getting a 1.4x extender for the lens. I can see good price for the Canon 1.4x II on Ebay and would like to know if anyone has tried the above combo and how is image quality?

Does the Tamron fits phisically on the Extender? Does autofocus works at the widest aperture of the lens at maximum focal length (400mm)? I have the 77d who is supposed to support autofocus at f/8.0.

Thanks for your input

 Pascallee's gear list:Pascallee's gear list
Olympus OM-D E-M10 Canon EOS 77D Canon EOS Rebel SL2 Canon EF-S 15-85mm f/3.5-5.6 IS USM Olympus M.Zuiko Digital 14-42mm 1:3.5-5.6 II +11 more
Canon EOS 77D / EOS 9000D
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