Pentax 555 - Manual (Page 68)

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!Viewing 3D pictures by the parallel method and cross method
As our eyes are positioned about 6 – 7 cm apart, there is a very slight deviation
between what we see with our right eye and what we see with our left eye. The
difference is processed by our brain to produce a three-dimensional image. This
principle is applied to taking and viewing 3D pictures.
3D pictures can be viewed by the parallel method where the left and right lines of
vision are virtually parallel, as when looking at a distant scene, or the cross
method where the left and right lines of vision are crossed, as when you cross
your eyes. A certain amount of practice may be necessary to view 3D pictures
without using the viewer.
!How to Assemble the 3D Image Viewer
Assemble the 3D image viewer supplied with the camera as shown below.