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Setting the Focus Mode on the EF 400mm f/4 DO IS USM lens

Setting the Focus Mode After autofocusing in ONE SHOT AF mode, focus manually by pressing the shutter button halfway and turning the focusing ring. (Full-time manual focus.)

Using the AF Stop Button on the EF 400mm f/4 DO IS USM lens

Using the Image Stabilizer on the EF 400mm f/4 DO IS USM lens

Image Stabilizer You can use the image stabilizer in AF or MF mode.

Setting the Focusing Distance Range on the EF 400mm f/4 DO IS USM lens

Switching the Focusing Distance Range If you autofocus outside the set focusing distance range, the lens may stop focusing at the start of the focusing range; however, this is not a malfunction. Press the shutter release button halfway again.

Using Extenders (Sold Separately) with the EF 400mm f/4 DO IS USM lens

Extenders Attach the extender to the lens, and then attach the camera. To remove it, reverse the order. Errors may occur if you attach the extender to the camera first.