Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 207)

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Correction of Lens Aberrations due to Optical Characteristics
Peripheral Illumination Correction
Vignetting (dark image corners) can be corrected.
o Depending on shooting conditions, noise may appear on the image periphery.
o The higher the ISO speed, the lower the correction amount will be.
o The correction amount applied will be lower than the maximum correction
amount that applied with Digital Photo Professional (EOS software).
o Peripheral illumination is corrected automatically in Basic Zone modes when
correction data is registered on the camera.
Distortion Correction
Distortion (image warping) can be corrected.
o To correct distortion, the camera captures a narrower image area than the
area seen when shooting, which crops the image a little and slightly lowers the
apparent resolution.
o Setting distortion correction may change the angle of view slightly.
o When you magnify images, distortion correction is not applied to the images
displayed.
o Distortion correction is not applied in movie recording.
o Images with distortion correction applied will not have the Dust Delete Data
( = 241) appended. Also, the AF point may be displayed out of position,
relative to the time of shooting.
o Distortion is corrected automatically when <
8
> mode is set to <
q
> mode
and correction data is registered on the camera.