To see the 3D photograph, the simple implement is necessary. The person with the good eyes may be able to see even if he or she doesn't use the implement.
The implement to use is the two magnifying glasses. Because the image blurs when bringing the eyes close to the photograph to see the three dimensional image, it becomes difficult to see.
The implement which I am using is the one to have combined the acrylic board to have bent into the L form and the two magnifying glasses.
 Magnifying glasses
 As for the magnifying glasses which I used, the diameter of the lens is 50 mm and the focal distance is 85 mm. You can know the focal distance by putting the magnifying glasses on the direction of the sun on the paper and measuring the distance between the magnifying glasses and the paper in the place where the image of the sun becomes the smallest. You must be careful so as not for the paper to burn.
Body of the viewer
I made the body of the viewer with the acrylic board with the 2-mm thickness. It is the simple one to have bent the acrylic board into the L form.
To consider is the distance between the photograph and the lens and the interval of the two lenses.
It makes the distance between the photograph and the lens the same as the focal distance. It decides the position which installs the magnifying glasses for the image of the position of the photograph to be able to be clearly seen by peeping into the magnifying glasses.
In the interval of the magnifying glasses, it makes 80 mm. This distance is related with the position of the camera when taking the photograph. The photograph which I took is made to be able to be well seen exactly when making the distance of the magnifying glasses 80 mm. It is adjusting to the interval of both eyes almost.
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