How does TTL bracketing work?

Bill Tuthill wrote:

One thing I noticed while doing flash-exposure studies on slide film
is that you *can* bracket, but only under-bracket, as follows:

Wait many seconds for full flash recharge, take a picture.

As soon as the red "ready" light comes on, take another picture.
The batteries don't have enough time to fully recharge the capacitor,
so the second picture is a bit underexposed.

For static setups where a bracket is required, this could work.
But I'd hate to rely on it.


This is not precise, and probably depends on your equipment,
especially the speedlight and design of the Ready light.

and then some!

Cheers,
Alan.

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