Canon CDI-E075-010 - Manual (Page 185)

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Appendix
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The following functions can be used with a Speedlite 220EX, 380EX, 420EX or
550EX.
- Auto Exposure (Use the E-TTL mode with a 550EX)
- FE Lock (Not available in mode)
- Flash Sync (1st-curtain/2nd-curtain) (2nd-curtain-priority with Speedlite 550EX)
- Daylight Synchro
- Slow Synchro
- Flash Exposure Compensation (When Speedlite 550EX is used, if flash exposure
adjustments are made both from the camera and the flash, the 550EX’s flash
exposure compensation setting takes precedence when the flash is set to E-TTL
mode. The camera’s flash exposure compensation setting will not activate.)
- Auto Zoom (Not available with the 220EX)