Lens Variables and Linear Distortion

Lens distortion is a common problem in photography, and it can be caused by a variety of factors, including the focal length of the lens, the distance to the subject, and the aperture setting. Linear distortion is a type of lens distortion that causes straight lines to appear curved in the image. It is most noticeable in wide-angle lenses, and it can be corrected using software.

Questions

• What are the different types of lens distortion?
• What causes linear distortion?
• How can linear distortion be corrected?

Answers

• There are two main types of lens distortion: barrel distortion and pincushion distortion. Barrel distortion causes straight lines to appear curved outward, while pincushion distortion causes straight lines to appear curved inward.
• Linear distortion is caused by the fact that lenses are not perfectly symmetrical. The amount of linear distortion depends on the focal length of the lens, the distance to the subject, and the aperture setting.
• Linear distortion can be corrected using software. There are many different software programs that can be used, such as Adobe Photoshop and GIMP.