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ゆがみは画像の周辺部に最も顕著に現れます。これらのザイデル収差は、ピンクッション (糸巻き型) ゆがみやたる型ゆがみとして知られています。
distortion refers to an image deformation, which is most pronounced towards the corners. these seidel aberrations are known as pincushion and barrel distortions.