|
The glass would be there because it does not move. The person, or parts of the person, do not show up because they are moving fast.
I have taken a 30 second exposure outside (using a ND filter) during the day and had people walk through the shot and not show up.
In the second photo, someone else has produced the light trail....or it is a composite, and the light trail was done on it's own and then the photos merged in Photoshop.
|