From: Larry Colen
Igor was asking about why I'd use the BFF (Really Big Flash) setup,
rather than simply the AF540.
Here is a photo of my flash setup for the group performance:
http://www.flickr.com/photos/ellarsee/5262376648/in/set-72157625475180697/
The near flash is in the middle of the back wall. I'm not sure of
the exact dimensions of the dance floor, but it's likely about 40x80
feet.
In the corner of the room, you can see the spot that they used (with
a pink gel) to highlight some of the dancers.
I had both cameras with me during the performance, and I'd shift
between the K-x with the 16-50 ISO 6400 wide open and the K20 with my
18-250 at (in this case f/9) at ISO 100.
K-x (cropped at 29 mm)
http://www.flickr.com/photos/ellarsee/5261765035/in/set-72157625475180697/
K20 (also at 29mm)
http://www.flickr.com/photos/ellarsee/5262373116/in/set-72157625475180697/
You can see, how even on the back half of the floor, inverse square
is really biting me with the dancers closer to the light close to
overexposed, while the ones in the back of the room are just about
right. In this case, I'm guessing that the nearest dancers are
probably 20' from the closest light, and 50' from the furthest.
You could probably get better balance between near and far if you find a
way to move the stands out from the wall & bounce the flash off the
ceiling. You'd give up a bit of power, but likely balance it a little
better so that the nearer dancers are not so overexposed.
You'd need to heavily sand-bag the stands to make them less likely to
get knocked over. Might even be worth getting some heavier stands. Rent
them if you can't afford to buy them.
How are you triggering the strobes? I don't see evidence of sync cables,
nor do I see any obvious radio slaves. Seems like using the built in
optical slaves would be vulnerable to anyone's flash setting them off.
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