Question about Canon SPEEDLITE 580EX TTL Flash
I just got my speed flash, so it all new to me. On the front of the flash there are three AF sensors , My question is, should they all light up when you press the shutter button?, because only one does. Thanks,Dom.
One is IR(infrared) sensor. If this one comes on, you can not see it. It's invisible to the naked eyes. Only animals, snakes and IR cameras can see it.
The red light that you see when pressing lightly on the shutter button is the AF assist light, not a sensor.
You can see that by looking at a mirror.
Posted on Nov 12, 2008
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Posted on Jan 02, 2017
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