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

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Ghost Images

The difference might not seem like much, but whether you use first-curtain sync (the default setting) or second-curtain sync (an optional setting) can make a significant difference to your photograph if the ambient light in your scene also contributes to the image. At faster shutter speeds, particularly 1/200th second, there isn’t much time for the ambient light to register, unless it is very bright. It’s likely that the electronic flash will provide almost all the illumination, so first-curtain sync or second-curtain sync isn’t very important.

However, at slower shutter speeds, or with very bright ambient light levels, there is a significant difference, particularly if your subject is moving, or the camera isn’t steady.

In any ...

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