parasitic aberration
parasitic aberration
"Parasitic aberrations" are not inherent aberrations like five Seidel aberrations, but residual aberrations which arise from magnetic non-uniformity of the polepiece material, inaccuracy of machining the polepiece and disagreement of the optical axes between lenses. The parasitic aberrations include axial coma aberration, star aberration, three lobes and axial two-, three-, four-, five- and six-fold astigmatisms.
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