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Distortion is optically created by the combination of different lenses with different magnifications.

One of the main rules used to limit distortion is the principle of symmetry.

The symmetry of the optics with respect to the diaphragm makes distortion zero.

Barrel Distortion

Barrel distortion tends to round out the center of the image.

Pincushion distortion

Pincushion distortion sharpens the center of the image.

Mustache Distortion

The mustache combines barrel and pad.