Lens distortion classification

    Pincushion Distortion, also known as pincushion distortion, is a phenomenon in which the picture caused by the lens "shrinks" toward the center. When using a telephoto lens or using the telephoto end of a zoom lens, it is most easy to detect pincushion distortion. Especially when using a focal length converter, pincushion distortion can easily occur. Pincushion distortion is most noticeable when there is a straight line in the picture (especially a line near the edge of the frame). The pincushion distortion rate of a typical consumer digital camera is usually 0.4%, which is lower than the barrel distortion rate. In contrast to pincushion distortion is barrel distortion.


                   barrel distortion 

no distortion lens   


   Barrel Distortion, also known as barrel distortion, is a phenomenon of barrel-shaped expansion caused by the physical properties of the lens in the lens and the lens structure. When using a wide-angle lens or using the wide-angle end of a zoom lens, it is most easy to detect barrel distortion. Barrel distortion is most noticeable when there is a straight line in the picture (especially a line near the edge of the frame). The barrel distortion rate of a typical consumer digital camera is usually 1%. The opposite of barrel distortion is pincushion distortion.


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