Canon EOS 6D Mark II Basic Instruction Manual - Page 138

3 Correction of Lens Aberrations due to Optical CharacteristicsN Peripheral light fall-off is a phenomenon that makes the image corners look darker due to the optical characteristics of the lens. Color fringing along subject outlines is called chromatic aberration. Image distortion due to optical characteristics of the lens is called distortion. And decreased image sharpness due to the aperture is called diffraction phenomenon. These lens aberrations can be corrected. By default, [Peripheral illum corr], [Chromatic aberr corr], and [Diffraction correction] are set to [Enable], and [Distortion correction] is set to [Disable]. If the lens correction data is registered (saved) in the camera, peripheral illumination corrrection, chromatic aberration corrrection, and diffraction correction will be applied in Basic Zone modes. (In the mode, distortion correction is also applied.) If the setting screen displays [Correction data not available] or the [ ] icon, it means that the correction data for the respective lens is not registered in the camera. See "Lens Correction Data" on page 139. Peripheral Illumination Correction 1 Select [Lens aberration correction]. Under the [z1] tab, select [Lens aberration correction], then press . 2 Select [Peripheral illum corr]. 136