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The spikes are diffraction spikes caused by a six-leaf iris in the camera
lens. (Six-leaf irises are the most common, although occasionally you will
see five-leaf irises, which cause either five or ten spikes.)
The pillar is a set of reflections from the edges of various lens
elements.
Note that, from the center of the picture, the little circles forming the
pillar are all directly opposite the Sun.
Keith Pickering
-----Original Message-----
From: "Jim McGough" <jmcgough_at_NWLINK.COM>
To: <METEOPTIC_at_listserv.funet.fi>
Date: Saturday, July 28, 2001 8:19 PM
Subject: Yet another web picture
>I hope I'm not wearing out everyone's patience, but I'm curious about the
>picture in the link below. Are the six-fold central "spikes" an artifact
of
>camera optics? What about the "pillar" below?
>
>Jim McGough
>
>http://www.bom.gov.au/announcements/calendar/nov.shtml
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