I don't know what camera you have and I don't know which mode you are using (manual exposure, full auto, shutter or aperture priority, etc.) so I can only make a generalized guess. It may be related to your shutter speed. Although your camera may have a wide range, for example 10 to 1/2000 second, your flash will only be properly triggered and synced over a limited range. I would take a few pictures with the shutter at 1/60 second and see if that helps. Also, on more advanced SLR's you can select a rear curtain mode. See if that may be a factor.
SOURCE: SB600 Works Erratically...
If red light on flash is blinking, flash is charging. In shooting rapidly, sometimes flash will go off even though it isnt fully charged. This can give dark shots. Flash eats batteries like crazy, best to always use fresh batteries for each shoot.
SOURCE: Flash only works in manual and is always flashes at full power!
This needs a good check. If you are in India, I can help you.
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