China Balls in Daylight
Posted 25 November 2011 - 02:29 PM
Shot is a typical beach scene, looking slightly down on the beach and edge of the sea. Girl walks/dances on beach amongst 20 or so China Balls.
We're shooting Kodak 5207 (250D).
We're shooting during the day time, in a warm sunny part of the world.
The director wants to know if we can get the china balls to show (as lit).
- Sunny 16 rule suggests at 250ASA and 1/250th, middle grey is around F/16
We're shooting at 25fps, so 1/50th, therefore stop down by 2 stops to compensate = f/32. Key is f/32
So assuming the sand is middle grey, I figure the china balls would need to expose at least 1 stop over key, so f/64. (or more?)
I have a 12" china ball here with a 200W bulb in it. At 20ft it gives a spot meter reading of f/32 (ie - at key). So with a 400w bulb, it would probably get to around f/64.
However, I very much doubt that sand will be middle grey. I imagine it will be light orange, if not white, and therefore at least 1 if not 2 or more stops over key, in which case the china balls would need to also be an extra 1 or 2 or more stops brighter - 800, 1600, or 3200W bulbs.....
Does this sound like sensible rationale?
I guess the basic question is, how bright does a light source need to be to be visibly bright in daylight?
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