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Lower Spherical
This aberrations has a strong softening effect on a telescopes performance. The light is partially moved from one side of focus to the other side. That way one side will look brighter than the other.

Picture
Picture
Picture

Both the in-focus (4x enlarged middle image) and the out-focus images tell a clear story going from 1/5 wave Lower Spherical to 1/3 wave lower Spherical. The images on the left have lost quite some light that has mainly moved to the right at the focal-point things also have changed. The first and second diffraction-ring got a brighter.

Picture
Picture

Again as a comparision the perfect 6 refractor against a 0.25 wave LSA telescope.  Colors and details are completely washed out.

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