Point-n-shoot-n wrote in post #14256482
I am wondering why you are shooting at ISO 2000 when using a flash?
Nothing wrong with cranking up the ISO. It brings up the ambient exposure, rather than rendering the background dark. It also requires less flash power so you get faster recycle and longer battery life.
I would expect you to be overexposing, not underexposing with an ISO of 2000.
E-TTL flash will take the ISO setting into account. One setting won't give different results than another, as long as the flash power required is within the range of the flash unit.
Check to see how brightly the flash is firing when you are getting the underexposures... you should be able to see if it isn't firing with enough power to get a proper exposure.
Huh? An underexposed image is pretty strong evidence that your flash unit isn't firing with enough power. The key is to figure out why.