TOPIC:

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ID Code: L6-39
Purpose: Show pincushion and barrel distortion.
Description: The optical system in the photograph includes the following: bright point source with condenser lens, ground glass screen, wire mesh object, first iris, 8 cm focal length lens, second iris, and distant screen, as seen in the photograph at the right above.

Set the two irises to about one-third of their maximum opening to obtain a distortion free image (photograph at left below). Opening the second iris (preceding the lens) causes pincushion distortion (photograph at center below), while opening the first iris (following the lens) produces barrel distortion (photograph at right below).

Availability: Available