>> On my camera (Canon 300D) the remote shutter release is just a stereo 
>> 2.5mm jack, easy to pick up from electronics stores and wire up 2 simple 
>> switches if you can solder.
>
> Simple way of getting around spending what they want for a remote. Might 
> want to look for a switch that closes one contact on a half press, and 
> another on full press to emulate the way the shutter button works. I don't 
> know how easy or difficult it would be to find a SPDT pushbutton switch, 
> though.
>
> (Searching...Aha, found one!)
>
> http://tinyurl.com/323qqz

For mine I used two toggle switches.  I found ones where you could flick 
them either way, to the left and they stay there (for long exposures) or to 
the right and they spring back (for repeated fast shots).  I just mounted 
them side-by-side in a small box and another 2.5mm socket, connected them up 
with a pre-made 2.5 mm stereo lead (I hate soldering those tiny plugs and 
they always come unstuck after a few weeks), and it all worked fine.

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