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And conversely this must be part of the phenomenon of improving an image by
looking through the aperture created by one's fingers, placed as you
describe below for seeing the shadow that indicates irradiation.  When I do
that without my corrective lenses, bright images appear sharper, with less
"ghosting", if that's the right word.

Jim Thompson
jim2@jimthompson.net
www.jimthompson.net
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> -----Original Message-----
> From: Navigation Mailing List on Behalf Of George Huxtable
> I have described in an earlier message how the effect of
> irradiation can be
> demonstrated. If you touch your first finger and thumb together
> in front of
> a bright backgrond, and then slowly separate them and bring them together
> again, you will see a shadow "jump" between them when the gap is very
> small. I haven't met anyone who fails to observe that effect, to some
> extent.

   

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