EOS 5D Mark IV: Digital Lens Optimizer

The EOS 5D Mark IV features several lens correction technologies built-in to the camera to maximise the performance of your lens. These include Digital Lens Optimizer (DLO), Chromatic Aberration correction and Diffraction correction. When DLO is set to enable, you may notice that Chromatic Aberration correction and Diffraction Correction are no longer displayed in the menu. This is because they are incorporated into DLO and they will both be set to enable as soon as DLO is turned on.
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Camera settings
EF Lenses
EOS 5D Mark IV