Is flash power setting saved in exif?

Does the camera record the flash power used ? I want to do some experiments with different diffusers and would like to know this info for my comparison.

Thanks.

AbPho wrote in post #11459404
Does the camera record the flash power used ? I want to do some experiments with different diffusers and would like to know this info for my comparison.

Thanks.

I'm not sure so I subscribed. I would just write it down.

But in full automatic you have no idea what the flash power was to get that shot.

Subscribed for the answer to a pretty good question.

AbPho wrote in post #11459465
But in full automatic you have no idea what the flash power was to get that shot.

Didn't realize you were talking about the on-board flash.

AbPho wrote in post #11459404
Does the camera record the flash power used ? I want to do some experiments with different diffusers and would like to know this info for my comparison.

Thanks.

No, it does not. The EXIF only records a few things relating to the flash such as whether the flash mounted fired, the flash mode and FEC, but nothing about the power level set on the flash manually or via E-TTL.

sucky

AbPho wrote in post #11459404
Does the camera record the flash power used ? I want to do some experiments with different diffusers and would like to know this info for my comparison.

Thanks.

Can't you just set the flash to manual mode and then meter the light going through the different diffusers?

Of course.

Interesting - what sort of a value would they put in the exif? A power setting would be dependent on the flash used.

It would be kind of neat to be able to read some strobist info straight off the EXIF. The only problem is most strobists use multiple flashes off camera, so that wouldn't work too well

Titus213 wrote in post #11460674
Interesting - what sort of a value would they put in the exif? A power setting would be dependent on the flash used.

^^^

...like how would 'full power' (from photo taken with a 430EX) be useful in its differentiation from 'full power' (from a photo taken with a 580EX) ?!

...and what about 'full power' when multiple flashes are involved, like shooting with 580EX on camera at half power with 430EX as slave firing full power...vs. 580EX off camera at full power and 430EX at full power on camera ?!

I don't necessarily need it in the EXIF, but when shooting EETL, I'm always curious how the flash fired. I'd like to know what it was thinking, and how much power it had in reserve. Especially when trying different modifiers, and multiple flashes.

If you are wanting to compare different diffusers, it might be easier and more meaningful to set both the camera and the flash on manual. Get a decent exposure with one of the diffusers, then bracket your exposure around that base reading. Then use exactly the same settings with exactly the same subject/target using the next diffuser, again bracketing around the exposure. Then the same with the next and so on. Compare the results. Just to be clear, when I say bracket, I don't mean auto-bracket. I mean manually add to and detract from the aperture setting. Just make sure everything is the same for each series except for the diffuser.

I said just curious, and when shooting ETTL. I shoot manual flash setting often enough, that I have a good idea how to set those up with different modifiers, especially in controlled environments, and in manual modes I know exactly how much power I'm asking out of my speedlites. But, when shooting outdoors, or in odd environments, and using ETTL, I've pushed beyond the limits of the flash. HSS modes come to mind as well. Would be nice to peek at it to see I was close, or at the limits, and if the power was displayed on the back of the camera, I'd find it somewhat useful. Setting up tests, in a controlled environment wouldn't help at all. And, just a curiosity, not highest on my list of feature requests.