> Doesn't the camera have some wireless (IR probably)
> remote ? That one would/could be easier to emulate.

Does this camera have LANC ? You don't say whether the
camera is a still or video, presumably still. I've done a little
work with a professional underwater cameraman's digital
video camera, using a LANC feed into the underwater housing.
LANC controllers are available pre-made, or fairly easy to
emulate with a PIC

eg

http://www.boehmel.de/lanc.htm

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