Originally Posted by BogdanD
Assuming you mean 'slow sync' as Pete described ("...so you can capture the ambient background light. This often results in a long or "slow" shutter speed, but the flash is still synced to the exposure.") - that's a function of camera settings and not the flash.
You have an XSi, right? If you're in an 'automatic' mode (green square or the basic scene modes on the dial), you can't control that. You need to be in Av, Tv, or M mode. For example, if you set a 1/15 shutter speed in Tv mode, with the flash attached, you'll capture more ambient light and the flash will still fire (and with E-TTL metering, it will expose properly). If you're in Av/Tv/M and the shutter speed is 'stuck' at 1/200 s with the flash on, you need to change custom function C.Fn-2 back to Auto (0 - the default setting).
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