Canon EOS M2 - Exposure

Auto Correction of Brightness and Contrastt
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 Under [54: Custom Functions (C.Fn) ], if [3: Highlight tone priority] is set
to [1: Enable], the Auto Lighting Optimizer will be set automatically to
[Disable] and the setting cannot be changed.
 Depending on the shooting conditions, noise may increase.
 When the effect of Auto Lighting Optimizer is too strong and the image
becomes excessively bright, set it to [Low] or [Disable].
 If a setting other than [Disable] is set and you use exposure compensation or
flash exposure compensation to darken the exposure, the image may still
come out bright. If you want a darker exposure, set this function to [Disable].
 In step 2, if you press the <B> button and uncheck [X] the [Disable
during man expo] setting, the Auto Lighting Optimizer can be set in the <a>
mode.
 The Auto Lighting Optimizer can also be set with [A3: Auto Lighting
Optimizer].