Canon EOS Rebel T6i EF-S 18-55mm IS STM Lens Kit Instruction Manual - Page 169

D Using the Built-in Flash  The exposure compensation amount will remain in effect even after you set the power switch to .  You can also set flash exposure compensation with [Built-in flash settings] in [z1: Flash control] (p.176). A Locking the Flash Exposure (FE lock)K If the subject is on the side of the frame and you use flash, the subject may turn out to be too bright or dark depending on the background, etc. Use FE lock in such a case. After setting the proper flash exposure for the subject, you can recompose (put the subject toward the side) and shoot. This feature can also be used with a Canon EX-series Speedlite. * FE stands for Flash Exposure. 1 Press the button.  The built-in flash will be raised.  Press the shutter button halfway and look in the viewfinder to check that the icon is lit. 2 Focus on the subject. 3 Press the button. (8)  Aim the viewfinder center over the subject where you want to lock the flash exposure, then press the button.  The flash will fire a preflash and the required flash output is calculated and retained in memory.  In the viewfinder, "FEL" is displayed for a moment and will light up.  Each time you press the button, a preflash is fired and the required flash output is calculated and retained in memory. 169