量一下你闪光器头部的尺寸，把剪下来的底儿修理一下，可能要做适当的弯曲，以使它们匹配。

Measure the dimensions of your flash gun’s head and mould the base to fit – you may need to make a few cuts and bends in the opaque plastic to get the right size.

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然后你有大约16秒时间重新构图进行拍摄，闪光灯的曝光量将保持在锁定值，不会因重新构图后曝光量改变而破坏拍摄结果。

You then have about 16 seconds to recompose and take the shot thereby guaranteeing the exposure you set and not have the camera reset a new exposure ruining your shot.

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另一方面，TTL模式是由相机和闪光灯决定输出光量的。

Through-The-Lens (TTL) mode, on the other hand, puts the flash unit’s output under the control of the camera and flash.

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