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Extenders Use an extender EF 1.4 x III or EF 2x III to shoot a larger image of a subject. Lens specifications when using an extender are as follows.

EF 600 mm f /4 L IS III USM Specifications

Using Focus Preset on the EF 600 mm f /4 L IS III USM lens

Setting the Focus Mode on the EF 600 mm f /4 L IS III USM lens

Using the Infinity Compensation Mark on the EF 600 mm f /4 L IS III USM lens