Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 142)

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Peripheral Illumination Correction
Vignetting (dark image corners) can be corrected.
z Depending on shooting conditions, noise may appear on the image periphery.
z The higher the ISO speed, the lower the correction amount will be.
z The correction amount applied will be lower than the maximum correction
amount that applied with Digital Photo Professional (EOS software).
z 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.
z 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.
z Setting distortion correction may change the angle of view slightly.
z When you magnify images, distortion correction is not applied to the images
displayed.
z Images with distortion correction applied will not have the Dust Delete Data
( = 274) appended.
z AF point display during playback in viewfinder shooting may be slightly
misaligned, due to distortion.
z Distortion is corrected automatically when < 8 > mode is set to < q > and
correction data is registered on the camera.