Optical Slave & ETTL II

I saw a post in another thread that got me thinking, and I didn't want to hijack the thread, so I figured I'd pose this question here.

If you have some studio lighting with optical slave triggers, and you use your pop up flash or a shoe flash to trigger them and you're using ETTL II, won't the first measurement flash from your shoe or pop up flash trigger the slave lighting, then when the actual exposure flash fires, the studio lighting wont't have time to recycle and would be useless?

Stamp wrote in post #11495985
I saw a post in another thread that got me thinking, and I didn't want to hijack the thread, so I figured I'd pose this question here.

If you have some studio lighting with optical slave triggers, and you use your pop up flash or a shoe flash to trigger them and you're using ETTL II, won't the first measurement flash from your shoe or pop up flash trigger the slave lighting, then when the actual exposure flash fires, the studio lighting wont't have time to recycle and would be useless?

For the most part, yes, that is true. However, if the strobe is set low enough that the strobe can recycle almost instantaneously, then it would be able to fire again when the main light goes off. Not very practical, thought.

Some strobes have a setting on them to ignore the first flash and fire on the second one. This would solve the problem. If you are using a shoe flash, just switch to manual and the pre-flash goes away. I cannot think of any time you would want to use eTTL shoes flashes mixed with manual strobes anyway.

That makes sense about the shoe flash, and I guess that's the easiest answer.

Stamp wrote in post #11496905
That makes sense about the shoe flash, and I guess that's the easiest answer.

You pop-up flash can be set to manual mode also, in case you weren't aware of it.

Neither can I. In fact, I can't think of any time you'd use eTTL in a studio anyway.

-Charles