I bought my Sanyo Xacti C6 with the purpose of taking video while scuba diving. A case is manufactured by Epoque, model number EHX-500X and also the EHX-400X for the C4. With this case you can use the camera, including all controls down to 50m/150ft. The camera/case cobination represents an extreemly economical way into underwater video, a "conventional" camera and case would cost at least 3 times as much. In addition the case is pretty robust and I would recomened one to anyone interested in filming outdoor activities from skiing to a day on the beach.
The camera works very well underwater and I have some great footage. I would upload some but you can't upload MP4s. If anyone is interested then contact me through the forum and I'll send you some. White balance is an issue but this is true of all underwater photography but the camera works well in the reduced lighting conditions and focus seems accurate too and usably quick. Most housings require both hands to hold, however the C6s one handed functionality is retained which is another big plus.
However, I do have some serious misgivings about the camera above the waves;
1 The flash is frankly pathetic, low powered, produces wierd skin tones and doesn't even have red eye reduction. This is a serious defficiency which is found on just about all other cameras regardless of price point.
2 The optics aren't the best. Even on highest settings the images appear soft.
3 The image stabalisation is poor and better turned off. Panning produces jerky footage even at 30 fps.
4 The most important problem is the extreem overexposure in bright lighting conditions. The exposure compensation dosn't seem to work in video mode. Is this a common problem or is there something wrong with my camera? Is there a firmware fix for this?
For my specialist application of underwater videography I can't recommend the camera/case enough given the bargain price. However far better video cameras are available at the price as are still cameras.