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Updated: May 21, 2025
Certainly there is no obvious and necessary reason for treating a picture containing a high moon as though you were three feet from the front plane of the scene presented, and a low moon as though you were twenty feet from that plane! The confusion which may result in the representation of other objects when these changes of eye-to-frame distance are made is shown by the following simple facts.
The height of the represented object is the same fraction of the real object as the eye-to-frame distance is of the distance of the observer to the real object.
When the eye-to-frame distance is eighteen inches, the diameter of the disc of the moon on the smeared glass will occupy exactly 1/115th of eighteen inches, which is between one-sixth and one-seventh of an inch. That seems to be an important fact for painters of sun-sets and moon-rises. But what do they do? They give to a high moon, if they are very careful, a quarter of an inch for diameter.
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