Depending on the Speedlite that you use, there are a variety of ways that you can control or modify flash exposure, either by making on-camera adjustments or by using the Speedlite controls. In addition, both the 5D Mark II and the Speedlite's Custom Functions enable you to customize various flash functions to suit your shooting requirements.
Because Speedlites differ in functionality, following are some general ideas about the ways in which you can control and modify flash exposure. For specific steps in setting exposure modification, see the instruction manual for the Speedlite(s) that you're using.
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