Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 401
Clearing All AF Microadjustments
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Clearing All AF Microadjustments When [ Clear all] appears at the bottom of the screen, pressing the < > button will clear all the adjustments made for [All by same amount] and [Adjust by lens]. Caution Precautions for AF Microadjustment The AF's point of focus will vary slightly depending on the subject conditions, brightness, zoom position, and other shooting conditions. Therefore, even if you perform AF Microadjustment, focus may still not be achieved at the suitable position. The adjustment amount of one step varies depending on the maximum aperture value of the lens. Keep adjusting, shooting, and checking the results until you are satisfied. The adjustment will not be applied to AF in Live View shooting or movie recording. When checking the results of adjustment, set to One-Shot AF and set [ Shot AF release prior.] to [Focus] before focusing. : One- Note Notes for AF Microadjustment It is best to make the adjustment at the actual location where you will shoot. This will make the adjustment more precise. Using a tripod when making the adjustment is recommended. When you will check the results of adjustment, consider shooting with image size set to JPEG (Large) and JPEG/HEIF quality (compression) set to 8 or higher. 401