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ISO's role in flash photography

xenonxenon Member
edited January 2012 in flash & lighting
What exactly does ISO do when shooting with a flash?
Do you change the ISO value for the same reasons as when you shoot without a flash (prevent motion/camera shake blur with slow shutter speeds and/or whenever you can't or won't open the shutter any more to let in more light) so you can get as good a shot of the ambient lighting, or are there other reasons for ISO that affect the flash part of the picture?

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