Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 143)

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Digital Lens Optimizer
Various aberrations from lens optical characteristics can be corrected, along
with diffraction and low-pass filter-induced loss of clarity.
If [Correction data not available] or [ ] is displayed by [Digital Lens
Optimizer] , you can use EOS Utility to add the lens correction data to the
camera. For details, refer to the EOS Utility Instruction Manual.
z Depending on shooting conditions, noise may be intensified together with the
effects of correction. Image edges may also be emphasized. Adjust Picture
Style sharpness or set [Digital Lens Optimizer] to [Disable] as needed
before shooting.
z The higher the ISO speed, the lower the correction amount will be.
z For movie recording, [Digital Lens Optimizer] will not appear. (Correction is
not possible.)
z Enabling [Digital Lens Optimizer] corrects both chromatic aberration and
diffraction, although these options are not displayed.
z Digital Lens Optimizer is applied automatically in Basic Zone modes when
correction data is registered on the camera.
Chromatic Aberration Correction
Chromatic aberration (color fringing around subjects) can be corrected.
z [Chromatic aberr corr] is not displayed when [Digital Lens Optimizer] is
enabled.