Page "Perspective distortion (photography)" Paragraph 11

Photographs are ordinarily viewed at a distance approximately equal to their diagonal.

When viewed at this distance, the distortion effects created by the angle of view of the capture are apparent.

However, theoretically, if one views pictures exhibiting extension ( wide angle ) distortion at a closer distance, thus widening the angle of view of the presentation, then the phenomenon abates.

Similarly, viewing pictures exhibiting compression ( telephoto ) distortion from a greater distance, thus narrowing the angle of view of the presentation, reduces the effect.

In both cases, at some critical distance, the apparent distortion disappears completely.