Pincushion distortion from spherical detectors

AI Thread Summary
Spherical detectors can cause pincushion distortion due to the way they project light onto a flat image plane, leading to the bending of straight lines inward. This distortion occurs because the light rays from the edges of the scene converge more sharply than those from the center, resulting in a visual effect where lines appear to bow inward. The discussion highlights a common misconception that the distortion would cause lines to bend outward, similar to flattening a hemisphere. Understanding this phenomenon requires a grasp of how spherical surfaces interact with light and the resulting image formation. Overall, the interaction between the detector's shape and light rays is crucial in explaining pincushion distortion.
senan
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I'm wondering how the use of spherical shaped detectors causes pincushion distortion. I can understand the shape of the detector affecting the final image but I thought the lines would bend out as when a hemisphere is laid out flat, a point appearing near the center from the front on angle would appear further away when the detector is flat. However every image of pincushion distortion has the lines bending in.
 
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Can you provide some context? I'm more familiar with field curvature in this regard.
 
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