Canon EOS 4000D Instruction Manual page 123

Lens Correction Data
The camera already contains lens peripheral illumination correction
data for approx. 20 lenses. In step 2, if you select [Enable], the
peripheral illumination correction will be applied automatically for any
lens whose correction data has been registered in the camera.
With EOS Utility (EOS software, p.310), you can check which lenses
have their correction data registered in the camera. You can also
register the correction data for unregistered lenses. For details, refer to
the EOS Utility Instruction Manual.
Peripheral illumination correction cannot be applied to JPEG images

already taken.
Depending on shooting conditions, noise may appear on the image

periphery.
When using a non-Canon lens, setting the corrections to [Disable] is

recommended even if [Correction data available] is displayed.
If you use the magnified view during Live View shooting, the peripheral

illumination correction will not be reflected in the image displayed on the
screen.
If the effect of the correction is not visible, magnify the image after

shooting and check it again.
Corrections can be applied even when an Extender or Life-size

Converter is attached.
If the correction data for the attached lens is not registered to the

camera, the result will be the same as when the correction is set to
[Disable].
The correction amount applied will be slightly lower than the maximum

correction amount settable with Digital Photo Professional (EOS
software).
The correction amount will be less if the lens used does not have

distance information.
The higher the ISO speed, the lower the correction amount will be.

3 Correcting the Image's Dark Corners
123