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Related to Pincushion distortion: Barrel Distortion
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They had slight pincushion distortion but no rolling distortion, and curvature of field was well taken care of.
The Multiscan sfII models offer new easy-to-use, intuitive digital on-screen controls (brightness, contrast, color temperature, horizontal and vertical size and centering, and pincushion distortion correction).
There is a very slight pincushion distortion at the edge of the field, which I only noticed when I was sweeping large, "solid" objects such as the Moon in and out of the field.
Distortion stretching the shape in the diagonal direction is called pincushion distortion, and that which compresses the shape in the diagonal direction is called barrel distortion.