Field curvature
A lens aberration or defect that causes the image to be formed along a curve instead of on a flat plane.
File Converters
Hardware or software that is used to convert files from one type of file format to another format.
Q: What is the field curvature ? Imagine that you've a perfectly flat object (e.g. a wall). If you focus using the center AF sensor of your camera the center focus should be spot on (more or less).
An important issue in zoom lens design is the correction of optical aberrations (such as chromatic aberration, and in particular, field curvature) across the whole operating range of the lens; ...
A fifth aberration, Field Curvature, results in the image from the lens being formed as a curved suface, not flat like film, so when the center of the image is in focus, the edges are not, and vice-versa.
 See also: Sharpness, Aberration, Lenses, Lens, Image
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