keiban

O.K Pamela at Gates gives me the answer:

"Outer diameter of the acrylic piece (dome) is 3.550 of both the GP35A and
the GP25A.
The number corresponds to the back side of the port that attaches to the
housing.  The 25 is for the 2.5 inch port opening and the 35 is for the 3.5
inch port opening.  They are specific to a certain series of housings.  The
aluminum port shells are shaped a bit differently overall but
the front dome is the same size.  We try to use the same parts across many
products to simplify production."

Thanks Pamela!

Hello,
Im building an small dome port for a minihousing, and saw at B&H the Gates Replacement Wide-Angle Dome for GP25A Port/GP35A Ports, anyone can tell me the diameters of them?
Thanks for the help!
Gustavo

yes, thats the idea, small camera on the head, turn it on before going down and thats it. With the memory card cameras is easy to dump the footage in the laptop and cut the unwanted pieces of the video. If your friend don't mind would be nice to see more pictures of the set up, to see how is mounted, etc.
The MC1 is nice when you want to control the shootting, frame, zoom, start/stop, etc, but the 10 foot cable is a pain. I like better all in one piece. Already have the Sony CX100 for skydiving use, which is an HD memory stick camcorder, and is just a little bigger than the MC1 head.
The GoPro and the like are low resolution, and I want big screen viewing pleasure!  
Thanks for all the answers,
Gustavo

my idea is to make a basic housing, just a tube with the camera inside, no controls, only start/stop...
Thanks.

I think the Xacti with Epoque housings are pretty decent and small enough. Although I'm not sure how you are going to mount it on your head.