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.
2. What effect might the lens coating have on the creation of sun stars?
None.
3. Does the position of the sun in the sky affect their size? (The Thumb
shot
was made mid-day whereas the Lake of the Clouds shot is at dawn.)
No. Neither does it help produce diffraction to hide parts of the sun
behind another object, but you need the contrast of the dark foreground to
see the diffraction spikes. Your first picture is a perfect example of
this, and if your film had much, much higher dynamic range it would also be
possible to see the spikes in the upper part of the image.
Regards,
Thomas Bryhn
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