What is a distorted lens?

Lens distortion is actually the general term for the inherent perspective distortion of optical lenses, that is, the distortion caused by perspective reasons. Distortion phenomena include pincushion distortion and barrel distortion. Pinch distortion is most easily detected when using telephoto lens or telephoto end of zoom lens. Barrel distortion, also known as barrel distortion, is a barrel expansion distortion phenomenon caused by lens. When we use a wide-angle lens or the widest-angle end of a zoom lens, we are most likely to detect barrel distortion. Distortion is caused by the large inclination angle of light. Unlike spherical aberration and astigmatism, distortion does not destroy the concentricity of the beam, so it does not affect the clarity of the image. Distortion shows that each part of the figure in the image plane is out of proportion to the original. Distortion is related to the position of the diaphragm. Distortion correction software called Panorama Tool is becoming more and more popular on the Internet. Photographers can easily correct barrel distortion and pillow distortion through this software. We corrected the distorted photo in the above picture with the panoramic tool. In addition, we can also correct the barrel-shaped distorted images output by digital cameras through a series of software such as Adobe Photoshop. After you get the hang of it, it won't be difficult.