Undocumented testing – as the Manual failed to explain how this works fully (or I missed it in the manual):
I thought my ST-E3-RT was faulty: Well this is my testing method over an hour last-night:
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Was wondering why my 600EX/STE3RT *beep* isn't functioning? Drove Me mental trying to work it out - initially thought I had faulty units, then thought it was proximity to the strobe.
But then I turned on the *beeps* on the strobes themselves and noticed they weren't beeping... Tried a different body, different lenses, used the 600EX as master, switch to optical, factory reset etc...
Then I stuck the strobes on 1:1 - and there we have it. They don't *beep* unless they are cycling. At low power output they will never *beep*.
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In my mind *ready Beep* should signify the system is ready to fire.
In actuality it only triggers when the capacitors are depleted and recycled.
Nowhere near as useful…
You would expect especially when shooting the flash-head through a window that the beep would tell you it’s ready but if you are on 1/8 power you will never hear it beep as it’s always ready.
But the second I put it on manual 1:1 and it took a second to cycle (12 batts) then it beeped every time.
Have already sent this through to Canon - doubt they can fix it :/