Canon speedlite 430ll

This tells you that the flash is in "Slave" mode
 
But is there any way of turning this off, you have to run it in slave mode on the 600D for it to work, and the same for any other wireless use I would say. It's a pain in the butt and distracting, can I put tape over it or will it interfere with the reviever
 
Whatever you do will interfere with it. Suck it up and deal with it.
 
But is there any way of turning this off, you have to run it in slave mode on the 600D for it to work, and the same for any other wireless use I would say. It's a pain in the butt and distracting, can I put tape over it or will it interfere with the reviever

You can put tape over it, it's only the AF assist lamp. E-TTL sensor is the darker window above.
 
That's the focus-assist light. The annoying slave mode flashing light is something different.
 
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