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J. Perelman
"Entertaining physics". Book 1.
Chapter 9. Vision one and two eyes

INCREASE PHOTOS

Is it possible to produce pictures so that normal eyes could properly consider them without glasses? Quite possibly - it is enough only to use cameras with telephoto lenses. After said earlier it is clear that the image obtained by a camera with 25-30 cm focal length, can be considered (one eye) at a normal distance - it will be quite a relief.

You can get such pictures, which will not appear flat when viewed even two eyes from a distance. We have already said that when both eyes receive from any subject two identical images, the mind merges them into a single flat picture. But this tendency quickly becomes weaker with increasing distance. Practice shows that the images received by the lens with 70-cm focal length, can be directly considered both eyes, not losing prospect.

The need to have a long lens again is uncomfortable. Therefore, we will point another way: it is that increase the image obtained by the ordinary apparatus. At this magnification, respectively, and extends the proper distance from which you want the picture to look. If a photo taken 15 cm lens, zoom in 4 or 5 times, this is enough to get the desired effect: a larger picture can be seen with both eyes from a distance of 60-75 see Some ambiguity snapshot does not interfere impression, as from a great distance she barely noticeable. In the same sense of relief and perspective picture undoubtedly wins.

Entertaining physics J. Perelman

 




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