Am 23.07.2018 um 17:26 schrieb [email protected]:
Non-zero parameters a and c introduce singularities at r=0, something a real
lens does not have.
Since the correction function itself doesn't have a singularity at r=0
and all that changes at r=0 is the slope of the curve there is a change
in magnification only in the center. Since a single mathematical point
can't be magnified there is no singularity either. The point in the
center stays in the center.
In the wiki discussion you write "sqrt() has a singularity at 0". This
is not true. sqrt(0) is 0
--
Erik Krause
http://www.erik-krause.de
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