> >
> > Can you tell more about the area in which you can see those rings and
> > their spacing? I'm curious about how diffractive it is.
>
> from what I remember, the rings appear to be about an 20-40mm from the
front
> element and about 3-4mm apart
Sorry, my question wasn't clear enough. The relevant thing is what
spacing at what distance from the center (or ring radius). (At least,
I assume the spacing varies with distance from the optical axis.)
Regards,
Peter Wagemans
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