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Digital camera pincushion distortion facts

By Jakob Jelling

Looking at the fantastic device that we know as the digital camera some really important facts regarding the problems this device might possess comes into view. Such a case is that of the digital camera pincushion distortion. This discussion is important as it reveals the various importance of the topic of digital camera pincushion distortion and it's implications upon the entire performance of the digital camera as a device. And this discussion strives towards that realization and understanding.

Basically defining the problem in somewhat more details it can be stated that pincushion distortion is a lens effect, which causes images to be pinched at their center. Pincushion distortion is associated with tele lenses and typically occurs at the tele end of a zoom lens. The use of converters often amplifies the effect. It is most visible in images with perfectly straight lines, especially when they are close to the edge of the image frame. See also the opposite effect, barrel distortion. Pincushion distortion can be in reviews as the amount a reference line is bent as a percentage of picture height. For most consumer digital cameras, pincushion distortion is lower than barrel distortion with 0.62% being a typical value.

In order to find the various means of correcting pincushion distortion,
pincushion distorted images from virtually any digital camera can be corrected easily using a set of free tools for Photoshop. This is important information in the area of every user of digital cameras. As opposite the pincushion distortion is associated with telephoto lenses or maximum zoom and the images appear pinched or bent inward toward the center. The pincushion is often less noticeable than barrel. Most digital cameras suffer from this type of distortions especially if it has a zoom lens. Many professionals mostly because of their unacceptable lens distortions have criticized the consumer digital cameras - effect which shows disturbingly on architectural and similar shots.

The software Photo Brush can correct these distortions. Because it can use high quality bi-cubic interpolation. The result images are both clean and sharp without any trace that the image was manipulated. This is truly professional quality function and only very few software packages can produce similar results. Lens technology has come a long way since the days of simple point and shoot cameras of a few years ago. It is now possible to correct many lens faults and color shifts because qualities of optical glass have improved considerably over the years. And thus it has become easier to fight against the digital camera distortion.

In general digital photography distortion may hardly be noticeable, but when capturing buildings, horizons or other subjects with straight lines, barrel or pincushion distortion may be clearly visible. There are possibilities to correct them in the user's image-manipulating program. Hence the understanding of the digital camera pincushion distortion is so very much essential.

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