Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 115
Exposure Compensation with ISO Auto
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5. Set the exposure and take the picture. Check the exposure level indicator and set the desired shutter speed and aperture value. < > or < > is shown at the ends of the exposure level indicator if the exposure level exceeds ±3 stops from standard exposure. Exposure Compensation with ISO Auto If the ISO speed is set to " " (AUTO) for manual exposure shooting, you can set exposure compensation ( ) as follows: With [ : Expo comp (hold btn, turn Quick Control screen )] in [ 6: Custom Controls] ( ) Caution Exposure may not be as expected when ISO Auto is set, because the ISO speed is adjusted to ensure standard exposure for your specified shutter speed and aperture value. In this case, set the exposure compensation. Exposure compensation is not applied in flash photography with ISO Auto, even if you have set an exposure compensation amount. Note In < > mode with ISO Auto, < > (Evaluative metering), and [ 2: AE lock meter. mode after focus] set to the default setting ( ), holding down the shutter button halfway will lock the ISO speed after focus is achieved with One-Shot AF. When ISO Auto is set, you can press the < > button to lock the ISO speed. If you press the < > button and recompose the shot, you can see the exposure level difference on the exposure level indicator compared to when the < > button was pressed. Any existing exposure compensation amount is maintained if you switch to < > mode with ISO Auto after using exposure compensation in < >, < >, or < > mode ( ). To coordinate exposure compensation in ½-stop increments with ISO speed set in ⅓-stop increments when [ 1: Exposure level increments] is set to [½-stop, Exp comp ½-stop] and used with ISO Auto, exposure compensation is further adjusted by adjusting shutter speed. However, the shutter speed displayed will not change. 115