Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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3
 Correction of Lens Aberrations due to Optical CharacteristicsN
1
Select [Distortion correction].
2
Select [Enable].
 
Check that [Correction data 
available
] is displayed for the 
attached lens.
 
Select [Enable], then press <0>.
3
Take the picture.
 
The image will be recorded with the 
distortion corrected.
Distortion Correction
 
When distortion correction is enabled, the camera records an image 
range narrower than the one seen through the viewfinder. (The image 
periphery is slightly trimmed and the resolution looks slightly lowered.)
 
During movie shooting, [Distortion correction] will not be displayed 
(correction is not possible).
 
Using distortion correction during Live View shooting will slightly affect 
the angle of view.
 
When you magnify the image during Live View shooting, distortion 
correction is not applied to the image displayed. Therefore, magnifying 
the periphery of the image may display parts of the image that will not be 
recorded.
 
Images with distortion correction applied will not have the Dust Delete 
Data (p.460) appended. Also, the AF point(s) will not be displayed 
(p.402) for image playback.