Hmm. I'd have to see some evidence of problems, but I imagine that if  
you're really diffusing the light a lot this could conceivably happen.

I don't see how the wedding photography could work with a preview ...  
given that most of your shooting happens in very constrained, set  
distances and poses, all you need to know is the right lens opening  
for the given scenes. I used to do weddings way back in the mists of  
time with a Nikon F and a Rolleiflex TLR, didn't even have an auto- 
flash at that time, just a good-old-potato masher, and found that in  
a reception situation I just had to know three-four setups and click  
the aperture to the correct one for the situation.

With a digital preview, I'd calibrate my head to the setups more  
accurately and then just dial in the aperture as needed.

Godfrey


On Mar 5, 2007, at 10:22 AM, Bruce Dayton wrote:

> Light modifiers are bounce cards, diffusers, umbrellas, light spheres,
> etc.  Where I could imagine the problem is that the pre-flash systems
> only send out a very small pop to determine exposure.  The situation
> becomes somewhat like when you try to meter past the capability of the
> meter - like old stop down - so the pre-flash is small and the light
> modifier cuts 3 stops of light and the little pop didn't put out 3
> stops to begin with.  Now the reading would be incorrect and the main
> flash pop would be too strong.  Not saying it would always happen, but
> I could imagine problems with some kinds of modifiers - especially the
> stronger diffusers.
>
> In some situations, taking a shot and then looking at the histogram
> would work well.  In wedding photography, that would mostly not work -
> you can't afford a test shot most of the time.


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