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Canon® EOS Rebel XSi/450D Guide to Digital SLR Photography by David D. Busch

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Using FE Lock and Flash Exposure Compensation

If you want to lock flash exposure for a subject that is not centered in the frame, you can use the FE Lock button (*) to lock in a specific flash exposure. Just depress and hold the shutter button halfway to lock in focus, then center the viewfinder on the subject you want to correctly expose, and press the * button. The preflash fires and calculates exposure, displaying the FEL (flash exposure lock) message in the viewfinder. Then, recompose your photo and press the shutter down the rest of the way to take the photo.

You can also manually add or subtract exposure to the flash exposure calculated by the XSi. Just press the Choose the Flash exp comp entry in Shooting 2 menu, and use the left/right ...

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