Will Flash TTL work when locking and recomposing image?

I shoot with a F100 and SB-80DX. I generally place my subjects in the

center of the frame (since this is where most of the light and

focusing sensors are), lock focusing and exposure, and then recompose

my image with my subject off center (thus obeying the rule of thirds).

 

Will the TTL flash know to give proper exposure to my subject which

is now off center, or will it try to give proper exposure to what

ever is in the center, since it still thinks that that is where my

subject is? If it does, is there any way of getting around this

problem?

 

Thank You in advance!

<p>You've run into the classic killer problem of TTL flash. "D" lenses and compatible cameras were invented to deal with this problem. The lens provides the distance to your subject, so the camera notes the exposure info, figures out how much light it will need to throw at the subject to properly illuminate it, and does so (largely, if not entirely, ignoring TTL flash measurements).</p>

<p>Hooray for smart designers!</p>

3D matrix balanced fill flash will take care of it, plain TTL can get fooled depending on the subject.

Itamar:

 

(1) You won't go to jail if you disobey the rule of thirds

 

(2) The Nikon flash system will expose for the object that you focus on. Hopefully someone else will explain this more, and confirm that you don't need a D lens for this to happen.

Itamar, I thought that if you locked the exposure then move the camera the flash will still use the values at the time of locking the exposure thus not take the current lighting into account. Which is what you want as you pressumably locked the exposure because you wanted a particular balance. Although don't listen to me as I have not done enough flash work yet. Must get round to it.