Digital TTL flash blowout on weak batteries?

Dante_Stella

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Apr 28, 2007
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Does anyone know why digital TTL flashes tend to start overexposing when batteries get low? My best guess is that the pre-flash runs off the batteries (with little capacitor involvement) and that as the batteries get weak, the system sees weaker pre-flashes reflected back and starts thinking that the subject is darker than it is. I've seen this with Nikon, Fuji, Metz and Leica flashes now.

Ideas?
Dante
 
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