Canon EOS Rebel T6i EF-S 18-55mm IS STM Lens Kit Instruction Manual - Page 142

3 Correction of Lens Peripheral Illumination and Aberrations  When distortion correction is enabled, the camera records an image range narrower than the one seen through the viewfinder. (Image periphery will be slightly cropped and resolution slightly lowered.)  Distortion correction will be reflected in the captured image, but not in the viewfinder or Live View image during shooting.  If you set [Distortion] to [Enable], the continuous shooting speed will decrease.  Distortion correction cannot be set in the or mode, when shooting a movie, or when Multi Shot Noise Reduction is set.  Dust Delete Data (p.272) will not be appended to images recorded with distortion correction enabled. Lens Correction Data The camera already contains data for lens peripheral illumination correction, chromatic aberration correction, and distortion correction for approx. 30 lenses. If you select [Enable], the peripheral illumination correction, chromatic aberration correction, and distortion correction will be applied automatically for any lens whose correction data is registered in the camera. With EOS Utility (EOS software), you can check which lenses have their correction data registered in the camera. You can also register the correction data for unregistered lenses. For details, refer to the EOS Utility Instruction Manual (p.406). For lenses incorporating the correction data, it is not necessary to register the correction data to the camera. 142