This digital technique is not really anything new and can have some good results. A problem with multiple exposures is with transient light, which is usually the best type.
One variation on the technique, is to shoot one raw omage, and make two (or more) raw conversions at different exposures, and then combine them. This obviously only helps with exposure and not focus, but solves the above problem.
It is one of the advantages of digital, but not really that significant.
Steve
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