I'm about to shoot a low budget music video. I will be SCUBA diving with a 5D mrk iii, at the bottom of an 8-9 foot pool. Talent will only be a couple feet underwater. I will line the pool with black cloth to make it seem like a large lake.
Can i get enough light out of an M18 or do I need a 4kHMI? I'm not sure how much light is lost bouncing off the top of the water and how much the water itself will diffuse the light...
Secondarily, should I black the bottom of the pool to reduce fill to get a nice ratio?
I hope some please on this forum have experience shooting underwater.