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Attaching the strap on the EF 400mm f/2.8L IS III USM lens

Setting the Focus Mode on the EF 400mm f/2.8L IS III USM lens

Using the Infinity Compensation Mark on the EF 400mm f/2.8L IS III USM lens

Using Extension Tubes (Sold Separately) with the EF 400mm f/2.8L IS III USM lens

Extenders Lens specifications when using extender EF1.4x II/ III or EF 2x II/ III are as follows.