This is how I made a waterproof case for my digital camera. It's not a super detailed instructable...more like a build-a-long. It's full of great ideas on how you can make your own...
One great hurdle this case solves is the camera interface. Mose DIY waterproof (hard) cases don't have a way of operating the camera's shutter. It's usually just turning on the camera and sticking it inside a box while it films.
My lake is frozen, so I'll need to wait until it thaws to get some good pics. I'm stuck with the sink for now!
Step 1: The Box I used...
Step 2: Hole For The Lense
WHEN YOU CUT YOUR HOLE: make it like 3 times larger than your camera's lens assembly! You can't make it too big! But you can make it too small... and that means you have a shadow around you video, called a vignette.
The hole in this photo was too small, so I later enlarged it.
Step 3: The Lens
Step 4: Gasket
The sticky side of this foam is on the lens.