These include barrel distortion, pincushion distortion and mustache/moustache distortion. In barrel distortion, the image magnification shows a negative correlation with distance from the optical axis and decreases. The deceptive effect is that of an image which has been photographed around a sphere (or barrel). In pincushion distortion, image magnification had a positive correlation with the distance from the optical axis and increases. The visible effect is that lines that do not go through the middle of the image are curved inwards, towards the centre of the image, like a pincushion. Finally mustache starts out as barrel distortion close to the image centre and progressively turns into pincushion distortion towards the image edge, allowing horizontal lines in the upper half of the frame look like a handlebar
These include barrel distortion, pincushion distortion and mustache/moustache distortion. In barrel distortion, the image magnification shows a negative correlation with distance from the optical axis and decreases. The deceptive effect is that of an image which has been photographed around a sphere (or barrel). In pincushion distortion, image magnification had a positive correlation with the distance from the optical axis and increases. The visible effect is that lines that do not go through the middle of the image are curved inwards, towards the centre of the image, like a pincushion. Finally mustache starts out as barrel distortion close to the image centre and progressively turns into pincushion distortion towards the image edge, allowing horizontal lines in the upper half of the frame look like a handlebar