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Image Quality Factor Series: Distortion
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Lens (optical) distortion is an aberration that causes straight lines to curve near the edges of images. It can be troublesome for architectural photography and photogrammetry (measurements derived from images).
Lens distortion and coefficients for correcting it are calculated in the Distortion module, and in Dot Pattern, which performs a CPIQ-compliant distortion measurement. SFRplus and Checkerboard measure distortion in nearly as much detail as the Distortion module, along with sharpness and several other factors. eSFR ISO measures distortion with slightly less precision than SFRplus.
Distortion is worst in wide angle, telephoto, and zoom lenses. It often worse for close-up images than for images at a distance.
Lens distortion and coefficients for correcting it are calculated in the Distortion module, and in Dot Pattern, which performs a CPIQ-compliant distortion measurement. SFRplus and Checkerboard measure distortion in nearly as much detail as the Distortion module, along with sharpness and several other factors. eSFR ISO measures distortion with slightly less precision than SFRplus.
Distortion is worst in wide angle, telephoto, and zoom lenses. It often worse for close-up images than for images at a distance.
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