[Terry B]

Originally Posted by Ian Robinson

I didn't know I could do that with a 40D , I'm getting one shortly . That will be a very useful feature and once I figure out how to drive the beast I'll make use of that .

BTW : I use B on my trusty old Minolta XD5 for long exposures and have a lockable cable release for the purpose , ie I open the shutter , tighten the little thumb screw to keep the shutter open , and release it to close the shutter at the end of the exposure.

Have a look at this post for instructions.