Canon EOS REBEL T7i Instruction Manual page 174

3 Correction of Lens Aberrations due to Optical CharacteristicsN
Depending on shooting conditions, noise may appear on the image

periphery.
The higher the ISO speed, the lower the correction amount will be.

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.
The correction amount applied will be slightly lower than the maximum
correction amount that can be applied with Digital Photo Professional (EOS
software, p.474).
174
Select [Enable].
3
Check that [Correction data

available] is displayed for the
attached lens.
Select [Enable], then press <0>.

Take the picture.
4
The image will be recorded with the

peripheral illumination corrected.