Canon 430EX ii

Tiberius wrote in post #16903033
What is there to explain? Unless you use the modelling light feature, then you will not see any preview of the effect of the flash until you take the photo. The flash will not emit any light until you take the photo because it won't fire until then. Using Live View won't make any difference. The camera can't figure out what the picture will look like with the flash lighting it and then create a simulation of it in live view. If it could, we wouldn't need flashes any more.

The way I read your previous post was the flash doesn't fire until after the photo is taken, meaning the shutter had already closed when the flash goes off.

yogestee wrote in post #16903140
The way I read your previous post was the flash doesn't fire until after the photo is taken, meaning the shutter had already closed when the flash goes off.

Ah, sorry. I meant that the flash doesn't fire until the instant the photo is taken. At this point, your can't see through the viewfinder. And even if you were looking, it's hard to tell what it looks like because the flash only lasts for an instant.

By far the easiest way to do it is to take a test picture and check it on the back of the camera.

Tiberius wrote in post #16907945
Ah, sorry. I meant that the flash doesn't fire until the instant the photo is taken. At this point, your can't see through the viewfinder. And even if you were looking, it's hard to tell what it looks like because the flash only lasts for an instant.

By far the easiest way to do it is to take a test picture and check it on the back of the camera.

Ahhhhh now,,, that makes sense.