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Re: [OM] Flare redux: Sun Stars?

Subject: Re: [OM] Flare redux: Sun Stars?
From: "John A. Lind" <jlind@xxxxxxxxxxxx>
Date: Sat, 08 Dec 2001 12:05:34 +0000
At 15:25 12/8/01, Thomas Bryhn wrote:
At 23:42 07.12.01, Joel Wilcox wrote:
So I guess these are my questions:

1. Is this kind of sun star a type of flare?

No. Flare is reflections inside a lens (or camera), the star effect is diffraction. In this case you obviously used a lens with 8 aperture blades, and the uneven diameter of your lens opening creates spikes like this. If your aperture was perfectly round there would also be diffraction, but it would be spread out evenly around the sun.
[snip]

Thomas has explained it exactly. You've also deduced how to enhance it by stopping down or diminish it by opening up the aperture setting. You can see the same effect from the luminaries and street lamps in these night shots:
  Six aperture blades on the 35/2.8 shift:
    http://johnlind.tripod.com/oly/gallery/om42.html
  Eight aperture blades on the 50/1.4 MC (the closest street lamps):
    http://johnlind.tripod.com/oly/gallery/om45.html
  Eight aperture blades on the 50/1.4 MC:
    http://johnlind.tripod.com/oly/gallery/om46.html

Steve Goss', Boris Grigorov's, Barry Bean's, and Acer's TOPE 2 "Night Pictures" submissions show this effect also (look at the larger pix; it doesn't show in the thumbnails):
  http://www.millennics.com/olympus/tope/gallery.html

-- John


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