Question about Canon SPEEDLITE 580EX TTL Flash

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420EX Flash and Preflash Shooting all power

My preflash used to only use 1/8th of the power but now it uses all of the power, so I have to wait the recycle time and the calculations don't make much of a differece, as the flash without preflashing also uses all the power. And then my shots underexpose (even close up) as if my shutter is faster than my flash.

I've never had this problem happen to me but now it is. Any ideas?

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If the flash fires but the photos are dark, this typically indicates a fault with one of the following:
- fault of the main transistor that triggers the flash
- fault of the fiber optic cable that connects the flash head with the body

What you have to understand is that when you see one flash in operation, on a properly functioning unit there are actually two flashes in sequence. The first, pre-flash is used for metering the scene, then the follow up is the actual flash that gives the light in the photograph. If the transistor is faulty then it may just discharge the capacitor during the pre-flash, not leaving any energy left for the main flash. If the fiber optic cable is broken (it is very fragile), then the metering stage fails and the flash logic decides to abort the main flash.

Posted on May 12, 2013

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I have exactly the same problem with my 580EX flash, can you let me know if you find a solution?

Thanks!

Joelle

Posted on Feb 20, 2008

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