Free (sorta): White-balance flip-down filter for the Light & Motion Bluefin FX1 housing
As seen in this Wetpixel feature:
http://wetpixel.com/i.php/full/expodisc-in...fin-hd-housing/
I did eventually test this, and it ends up producing an aggressive white-balance (which ends up looking red). This should be easy to adjust by using red marker or a slightly red filter on one side of the filter (fairly common in white-balancing practice these days).
This would be a great starting point, if you're looking to experiment.
$5 shipped to continental USA.
