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Canon 300mm f/2.8L IS + EF Extender III 1.4X

This page shows how the 1.4X extender performs with the Canon 300mm f/2.8L IS USM. With the 1.4X Extender, the 300/2.8 becomes a 420mm f/4.

Test scene

As shot.

Live View with Mode 2 was used for zero vibration, along with contrast-detect autofocus.

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Canon 5DMark II + 300mm f/2.8L IS + Extender III 1.4X

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