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If you are getting a 40D I would strongly suggest you also get the TC-80N3 remote for it as well. This will allow you to set the camera to bulb and then dial your exposure time (up to 99 hours from memory) and number of images at that exposure into the remote. Hit start and basically walk away. I use one with my 20D and it is a god send. The instruction manual is very easy to follow and after one night's use you really don't need the manual.
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