Doublet Glass

Which of these spherical aberrations can be overcome?

On the way in which the spherical aberration can be overcome is the following: A choice to use only high quality glass to make lenses. Set B using aspheric lenses that are specially shaped (non-spherical). C coating lenses with special films that reduce lens flare. Using D lens doublets where the two lenses add to spherical aberration. Choose which only E lenses are perfectly spherical.

B) can certainly correct the spherical aberration, but many prefer to avoid lens desgners this method because these aspheric surfaces are difficult to manufacture economically, so they typically go with D) doublet lens use, or even more complicated designs, because even with these multiple spherical lenses, it is still cheaper than B) E) is a non-thinking of D), in that the only use of "only" spherical lenses do not resolve the problem --- it requires careful design and balancing A) is always a good idea for any design objective is obvious, and yet, in itself, it does not cure the spherical aberration C) A response ditto) Final: Let B) or D) if D) means that the aberrations of lens are offset (essentially) to eliminate spherical aberration. In fact, it can never be a perfect optical design where there no spherical aberration at all, the best can be done is for it to be minimized.

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