One of the great dilemmas with shooting video in caves is the limited amount of light available in an underground environment . . . none. You need an enormous amount of light to illuminate for video, which is fairly easy when you are above ground in the daylight or near an electrical source at night. When you are lighting a cave however that is in the middle of nowhere and requires miles of hiking to get to the entrance, traditional video light options are not at all practical. In fact, even standard portable video lights, can become an enormous burden when hiking several miles in the backcountry, and the amount of light output you get from these sources is no match for a large room.
In my ongoing search for a remedy I resorted to building my own video light with Luxeon Star 3 watt LED’s. The idea was that with LED technology I should be able to build a durable, light-weight source that would at least take the place of the heavier portable video lights. To make a long story short I succeeded in building a functional light, but the light output didn’t quite reach the intensity I had hoped for. I still need to run some tests in order to more precisely determine it’s output and compatibility with with my new video system, the Canon 7D.
In the mean time, below are some useful charts for those interested in converting Lux into EV. Many light manufacturers give you the output of their product in lux or lumens, which is nice to know, but since most photographers work in EV, apertures and shutter speeds, it is good to know how to convert these numbers into something that makes a little more sense. Enjoy.












Slow Motion with Cinema Tools
A great tutorial for converting 50/60p footage to 25/24p for slow motion effects. Thanks Philip Bloom!
http://philipbloom.net/tutorials-1/how-to-turn-50p-and-60p-into-slow-motion-with-cinema-tools/