Skip Russell emailed me to send me this link to his pictures from the Maker Faire - great job, as the lasers are not easy to capture on camera…

http://www.flickr.com/photos/skipr/tags/laserharp/

Looking at the EXIF data, it was 18mm, at 1/5s F3.5 - not sure about the ISO, but I should imagine it was set fairly high. Short exposure time and center-weighted metering help to capture the swirling fog patterns quite nicely…