New answers tagged depth-of-field
If done right, these kind shots can look amazing. One technique is to have your subject stay perfectly still for the 25 - 35 seconds you need for the exposure. Some photographers do this really well; Paul Zizka comes to mind. The other common technique is taking several exposures and masking in Photoshop. Depends on how skilled you are with masking, this ...
You can either use a flash to expose the subject (you won't be able to see them walking into or out of the frame), or you can, as you suggest, take two shots and blend them in Photoshop - a matter of a few minutes work. Making an exposure blended shot would require the subject to stand preternaturally still between shots for a decent effect.
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