Canon EOS Rebel T5 18-55 IS II Kit - Manual (Page 121)

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3 Correcting the Image’s Dark Corners
The camera already contains lens peripheral illumination correction
data for approx. 25 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.318), 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 (p.321) on the Software Instruction
Manual CD-ROM.
Lens Correction Data
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 shown on the
LCD monitor.
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 has not been 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).
If the lens does not have distance information, the correction amount will
be lower.
The higher the ISO speed, the lower the correction amount will be.
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