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CMS-XML Setting the Focus Mode on the EF 400mm f/2.8L IS III USM lens
Setting the Focus Mode The lens' focusing ring is electronic. When AF operation is set to [ ONE SHOT], manual focus is possible after autofocusing has been completed by continuing to press the shutter button halfway (Full-time manual focus). There are times when camera setting changes are required.
CMS-XML Lenses that support changes in the AF speed on the EOS C500 Mark II
The AF speed (10 steps) and AF response (7 steps) can be changed. Also, AF speed can be selected to be applied constantly or only when recording. The lenses below will allow the AF speed to be altered from within the camera's menu.
CMS-XML Using the AF Stop Button on the EF 400mm f/2.8L IS III USM lens
CMS-XML Using Extenders (Sold Separately) with the EF 400mm f/2.8L IS III USM lens
Extenders Attach the extender to the lens, and then attach the camera. To detach it, reverse the order. Errors may occur if you attach the extender to the camera first.
CMS-XML Using the Image Stabilizer on the EF 400mm f/2.8L IS III USM lens
MODE 3 Shooting irregularly moving subjects Setting the STABILIZER switch to OFF is recommended when you are taking pictures using the Bulb setting (long exposures). If the STABILIZER switch is set to ON, the Image Stabilizer may introduce errors .