the S860 has three flash modes in which the flash only fires under certain conditions.
- in Auto Flash mode and Auto & Red Eye Reduction mode, the flash will only fire if the subject or background is dark; otherwise it won't flash.
- in Slow Synchro mode, the flash only fires when the camera's using a slow shutter speed.
if you have your flash mode set to any of these, the flash will only fire when the camera determines that flash is needed; otherwise it won't fire. to have the flash fire all the time and automatically vary its intensity according to how much light is needed, set the flash mode to Fill flash; to turn the flash off altogether (so that it won't fire no matter what), set the flash mode to Flash Off.
for all the details on the S860's flash modes, you can download the user manual
here and refer to pages 28 and 29.
hope this helps...
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