barrel distortion

Essentially it is just barrel distortion but only in the horizontal plane.

Like many other zoom lenses, it exhibits some barrel distortion at the wide end of its range.

All the ultra-wide angle lenses suffer from some amount of barrel distortion.

Barrel distortion is evident at the wide end.

The lens exhibits strong barrel distortion and chromatic aberration at the wide end.

Aperture angles of 180 or more are possible only with large amounts of barrel distortion.

In "barrel distortion", image magnification decreases with distance from the optical axis.

Severe barrel distortion blurs the corners, as though you took everything with a fisheye lens.

Although modern design methods have been continually reducing this problem, barrel distortion of greater than one percent is common in these large-ratio lenses.

Not to be confused with barrel distortion, in which the image appears to be warped onto a sphere.

Barrel distortion is average for this class of lens, but vignetting is better than average.

An in-camera feature compensates for lens pincushion- and barrel distortion in the image.

Characteristic of zoom lenses, it exhibits some barrel distortion at its shortest focal length.

In this example pincushion- and barrel distortion can be corrected in the camera firmware as well.

Vignetting, barrel distortion and chromatic aberration are also problems that are difficult to eradicate.

The image must first be removed of distortions, such as barrel distortion to ensure that the observed image is purely projectional.

Barrel distortion becomes quite noticeable at the wide-angle setting and chromatic aberration (purple fringing) is common.

Conversely, barrel distortion is actually a diminished radius mapping for large radii in comparison with small radii.

The straight blue lines I drew in Photoshop show the bowing of the barrel distortion of the wall and metal:

Barrel distortion typically will have a positive term for whereas pincushion distortion will have a negative value.

Photo manipulation packages have functions to correct images for various lens distortions including pincushion, fisheye and barrel distortions.

Viewers closer or farther away will see a pincushion or barrel distortion, and the curved nature of the screen will become apparent when viewed off-axis.

Distortion (optics), including "barrel distortion" and "pincushion distortion"

The amount of barrel distortion is subject to individual differences, which explains the fact that the perceived intensity of the globe effect varies significantly between different observers.

Ultra wide-angle lenses that do not produce a rectilinear image (i.e., exhibit barrel distortion) are called fisheye lenses.