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a common optical problem that occurs when a lens is either unable to bring all wavelengths of color to the same focal plane, and/or when wavelengths of color are focused at different positions in the focal plane

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an image entails conversion of a continuous gradation of tone to several regions of fewer tones, with abrupt changes from one tone to another. This was originally done with photographic processes to create posters

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in computer graphics, the jagged, or saw-toothed appearance of curved or diagonal lines on a low-resolution monitor.

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sare caused by compression when an image is saved in the .jpgformat. Each time an image is saved in this format it is compressed and “non-essential” data is discarded. The result of compression is that an image can suffer from blockiness, mosquito noise (around edges) and color degradation

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is an effect associated with wide-angle lenses and, in particular, zoom wide-angles. This effect causes the image to spherize, which means that the edges of the photo look curved and bowed to the human eye.

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an image sensor format approximately equivalent in size to the Advanced Photo System "classic" negatives of 25.1×16.7 mm, an aspect ratio of 3:2.

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is an image sensor format approximately equivalent in size to the Advanced Photo System "classic" negatives of 25.1×16.7 mm, an aspect ratio of 3:2.

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uses a sensor that's the same size as a single frame of traditional 35mm film, measuring 36 x 24mm.

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is a solid-state device, the part of the camera's hardware that captures light and converts what you see through a viewfinder or LCD monitor into an image. Think of the sensor as the electronic equivalent of film.

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is the ratio of a camera sensor's size to a 35mm film frame. Use it to calculate effective focal lengths and compare lenses between DSLRs. Crop factor is a term that describes the difference between your camera's sensor size and a traditional 35mm film frame.