M31 Stereo. Originally captured with a Borg 101ED apo on Oct. 13/07. In order to view this as a single stereo image, you must stare at the center, relax your eyes, allow them to become cross-eyed, until you see the combined image appear. It takes some practice, but the effect is impressive.Viewing in this 3-D manner may cause headache, nausea, and/or eye discomfort, so do not view in this way if you are prone to these problems.