430EX question

Started Feb 5, 2013 | Questions thread
apersson850 Senior Member • Posts: 1,209
Re: 430EX question

ihgold2 wrote:

Or maybe, I suppose, I might like to give distance to subject as my input and have the flash tell me the necessary power based on current ISO/aperture.

Maybe that's what ETTL is already doing.

That's indeed the most common way of doing it, since often you want to be at a certain distance from your subject and you want to use a certain aperture. Only if this brings you outside of the flash' capability, you'll consider changing one of these two parameters.

And you're right in that this is exactly what E-TTL attempts to do for you.

The max guide number of Canon's flashes is the one given by the model designation. So for a 430 EX (II), it's 43. But that does of course take that you use meters. Note that they list the guide number at the max zoom setting of the reflector, so it's true only when the flash is zoomed to correspond to the coverage of a 105 mm lens on a 24*36 mm format camera.

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