G'day Mick,
For a start, I do not do serious astrophotography. When I do take pictures of the night sky for a star trail or even an aircraft trail then I use the cable release that you can buy for the 350D. I have heard that if you are handy with a soldering iron and know one end from the other then you can knock up a cheap and perfectly adequate cable release of your own.
I'm not at all handy with a soldering iron (I refer you to the Great Fire of London) so opted to spend the dollars and get the Canon brand cable release.
Peter.
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