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FE lock
Freedom to reframe while maintaining ideal subject lighting.
image:FE lock
FE lock     EF17-40mm f/4L USM, 6sec., f/8
Sample photo analysis 
image:FE (Flash Exposure) lock
FE (Flash Exposure) lock
image:Without FE lock (overexposed)
Without FE lock (overexposed)
A sheet of music is the main subject of these images. With dark backgrounds, the act of reframing the subject often results in overexposure. But the combination of FE Lock and an EX Series Speedlite enabled the sheet music to be captured with the right exposure even after reframing the scene.
Framing readjustment without worrying about the flash.
Reframing the image after locking the focus can sometimes dramatically alter the required exposure level. This problem can easily be eliminated, however, by using FE Lock to maintain the initial flash level. Similar in many ways to the AE Lock function, FE Lock uses spot (or partial) metering to determine the ideal flash level and fires the flash accordingly when the shutter button is pressed to ensure appropriate exposure of the subject even during reframing.
Slow sync  
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