Bolt VX-760N User Manual page 26

Note: When decreasing the flash output in increments of one-third from one setting to a lower setting + 0.3
or 0.7, you will need to decrease it to the next lowest setting, and then fine-tune it up. For example, when
decreasing from 1/4 to 1/8 + 0.7, you will need to decrease to 1/8, and then increase to 1/8 + 0.7.
When setting exposure settings on your camera, the highest shutter speed available will be your camera's
flash sync speed.
Tip: For best results, use a handheld light meter when shooting in manual flash mode
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26 26 Using the Manual Flash Mode