View Full Version : sLave optically?
3rd of February 2005 (Thu), 22:13
Hi there, i was reading about the slave optically function of the Sigma 500SUPer DG
how does that work exactly?
3rd of February 2005 (Thu), 22:28
It has a sensor which triggers the flash when it "sees" another flash.
4th of February 2005 (Fri), 05:58
Optical Slaves sense the light pulse from another flash and fire the flash they are attached to. The firing is so quick that the camera doesn't notice any delay. This is not compatible with ETTL. If you are going to use this function, the flashes must be in Manual or Auto Thyristor. The pre flash from ETTL will set off the optical slave.
4th of February 2005 (Fri), 10:17
ahh icic, thanks for the quick replies. :D
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