[APML] Long vs. Stacked Short Exposures

[RBissinger@aol.com]

I'm sure this has extensively been covered but I'm planning on doing some wide field shooting of the Milky Way this weekend, and can expect to have a few Perseid meteors in my shots.  Maybe the streaks will look good, but I was wondering if I'd be better off taking, say two 20 minute exposures rather than a single 40 minute exposure?  If I took those two 20 minute shots, scanned them, and stacked them, how close would I get to the results in a single 40 minute exposure?  I'll be shooting E200 with a 28mm lens at f/2.8, thanks.
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