The built-in flash fires by itself (EOS 90D)
Solusi
To turn off auto flash for the built-in flash, change the flash setting to [ Off ].
1. Set the camera's power switch to <ON>.
2. Turn the Mode dial to a Creative Zone.
3. Press the < 
> button.
> button.
4. Press the < 
> button to select the [ 
] tab.
> button to select the [ ] tab.
5. Turn the < 
> dial to select the [ 
] tab.
> dial to select the [ ] tab. 
6. Turn the < 
> dial to select [ Flash control ], then press < 
>.
> dial to select [ Flash control ], then press < >.
7. Turn the < > dial to select [ Flash firing ], then press < >.
> dial to select [ Flash firing ], then press < >.
8. Turn the < > dial to select [ 
], then press < >.
> dial to select [ ], then press < >.
(When the shooting mode is set to < 
>)
>)