Pentax Optio 33L Operating Manual page 61

How to view 3D pictures with the 3D Image Viewer
Print out the pictures so they are 11cm to 12cm wide. Place the 3D
Image Viewer divider between the two images.
The distance between the eyes differ from person to person. Some may
not see a three-dimensional effect even with the same size print.
Pictures too large or too small make seeing the three-dimensional effect
very difficult. Try different size prints until the right effect is achieved.
• Never look at the sun through the 3D Image Viewer.
• Do not leave the 3D Image Viewer in direct sunlight, as this may
cause a fire.
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