Night shots are always a big gamble, so the usual 3 brackets won't do (in particular not with all the set-up work involved....better safe than sorry) If you then start with 1 minute as the smallest increment (=shortest shuttertime), you end up with 1+2+4+8+15+30+60+120 minutes, or 4 hours total. Now, you can do all that by hand, and miss a lot of sleep, or you can let a timer do the job (in particular with those higher-end EOS bodies that don't consume any power while the shutter is open)).
Willem,
What kind of night photography are you doing that might result in exposures that vary by a factor of 128X ?
-- Bud Kuenzli
In cyberspace when you get where you're going you still don't know where you are.
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