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Higher Spherical
This aberrations has a less profound effect on images that the Lower Spherical. Again light is moved from one side of focus to the other

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The above image shows a 0.5 wave LSA and below 0.5 wave HSA with + 2 and - 2 waves defocus.

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A comparision of 1/4 wave HSA (right) and LSA(left) in a 6”refractor

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