BlurFix provides a flat lens to correct the issue of soft images when shooting underwater (see an OTech comparison video HERE). Their color correcting filters correct the blue and green cast of underwater video. This color cast is due to reds and oranges in the color spectrum not being able to penetrate past water’s surface very well. In the test videos I shot in Maui, you can see the color correction with the BlurFix color filters applied. Note that the lens filters did fog up a bit since I did not use an anti-fog solution for them. BlurFix does provide moisture absorbing beads in their housing kit, but in some extreme cases where you’re in the water for extended periods of time and you’re taking your camera back and forth between different temperatures, I would suggest using an anti-fog liquid.
The Snake River Prototyping Stabilizer Tray provides steady shooting when underwater. I had fins on and was paddling a lot to stay under or just to track fish, this caused my body (and hands) to move around a lot. For this reason, underwater video can be difficult when you’re simply snorkeling. The stabilizer helped me steady my shots when shooting on a camera as small as the GoPro HERO 2. I also used a leash so I wouldn’t lose the tray or the camera.
*You can see in the video below what footage from a GoPro looks like not only without the color correcting filter but also minus the stabilizing tray.