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
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|