7D Sensor with long exposure?

G:

Here is what Brian was mentioning earlier about the shadow. (Sort of) This was a 4 second shot using flash on 2nd curtain sync. Basically I told my daughter to hold still for 3 seconds, then move to her right. The flash would fire exposing and freezing her actual image on the second part. The shadow was from 3 seconds of her body blocking the moon light behind her. Getting the ghosting of her outline. The same thing would apply to your 2 minute shots if someone was walking accross the shot. Since they are not actually in one spot but a brief second through the 2 minutes, they do not really shadow at all.
Ken
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Happy to Photograph!
Ken
http://kennyb.smugmug.com