A fundamental optical rule: All parts of a lens contribute to all parts
of an image.
If the defects are sizeable you can black them out such that they can't
contribute anything to the image except a bit of diffraction around the
black edges.
Chuck Norcutt
swisspace wrote:
> I think this is maybe because the fungus is around the edge of the lens
> and hence probably outside the view of the sensor. I haven't used it
> much on an OM yet.
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