For lighting, they used three Nikon sb900’s. One was connected via pc sync in a soft box and the other two were optically slaved.
Alex and Jamie made a custom camera rig as one was needed to put the cameras as close together as possible while roughly emulating the distance between the human eyes.
The pairs of images were then batched and sorted using Aperture before being exported into Nuke. Final tweaks were made in Nuke before combining them into the final anaglyph 3D images.
"...while Nuke allowed us to simply adapt many of the same 3d work-flows we use in our day jobs as stereoscopic visual effects compositors." says Alex and Jamie.
They also printed a limited edition run of 25 books for the exhibition using the self publishing website Blurb.
More details here;
http://stereoportraitproject.com/
Looks to be a very cool exhibit. Go check it out!