Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 189

Dust Delete Data Acquisition Preparation Dust Delete Data Appending Dust Delete Data used to erase dust spots can be appended to images in case sensor cleaning leaves dust on the sensor. The Dust Delete Data is used by Digital Photo Professional (EOS software) to erase the dust spots automatically. Preparation Prepare a solid white object such as a sheet of paper. Set the lens focal length to 50 mm or longer. Set the lens's focus mode switch to < > and set the focus to infinity (∞). If the lens has no distance scale, rotate the camera to face toward you and turn the focusing ring clockwise all the way. 1. Select [ : Dust Delete Data]. 189