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Message: <blockquote data-quote="hark" data-source="post: 179570" data-attributes="member: 13196">If you were to take a photo similar to Rick's above and put a neutral density filter on the lens, the filter would force you to use a really slow shutter speed. The unmovable objects such as the bench, window, picture, and plant will be recorded for the entire time.When someone sits in the photo for a substantial enough time (like Rick said, his son sat for 5 seconds out of the 10 seconds), it will record on the image as being ghost-like or transparent. If someone just runs through the photo from the left to the right quickly, it shouldn't record them. They aren't in place long enough to be captured. I'll have to see if I can find the video I recently watched--someone took a photo of a highway using a neutral density filter. Even though there were cars moving on the highway, the photo shows an empty highway.</blockquote>