New formula for eliminating spherical aberration

alanrockwood said:

Thanks for the comments.

I think that using the paraboloid surface to correct spherical aberration only applies to mirrors, not lenses. For mirrors the correction for spherical is, of course, perfect. Off-axis perfomance is, however, not great, which is the reason that Schmidt optical designs are often used for wide angle telescopes.

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alanrockwood said:

Yes, I would say it is somewhat the same thing.

Engineers often face problems where they need to optimize three parameters, such as fast, good, and inexpensive. Then they say "you can have any two of the three. Which two do you want?"

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Dali said:

Isn't Schmidt design including a freeform lens?

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AgX said:

No, but an aspheric element. I is a of peculiar shape, wavy in radial section, but still rotational symmetric.

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