Re: Incorrect Seidel aberration calculations in lens design codes

On Feb 22, 1:45 pm, Al Greynolds <awgreyno...@xxxxxxxxxxxxx> wrote:
On Feb 22, 11:15 am, Helpful person <rrl...@xxxxxxxxx> wrote:



But the 2nd order is not an aberration.

But it changes the paraxial properties of the surface and therefore
the contribution to the next order aberrations.  I have done the math
and the 2nd order term DOES also change the Seidel contributions (just
as LENSFORGE realized but not ZEMAX).

Al

It will effect the following lenses because it changes their
conjugates. Remember that the Seidels are an approximation and have
never (even originally) been thought of as anything else. The change
to the following individual lens Seidels is very small, smaller than
the Seidel approximation.

To my knowledge the second order terms are never considered.
.

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