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05-22-2012, 08:20 AM   #16
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I have had starbursts on night shots at f/6.7 as on this shot of Lake George last summer. My main goal on this shot was just to get it as I was hand holding the camera. The starbursts added a nice touch I didn't expect.


05-22-2012, 11:39 PM   #17
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Can anyone explain why there are 14 points in the star? The DA15 has 7 aperture blades, if it had 9 would there be 18 points?
05-23-2012, 12:18 AM   #18
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That's correct Joe. If there's an odd number of aperture blades you get double the points. If the number is even, you get the same number of points, e.g. 8 blades gives 8 pointed starbusts.
05-23-2012, 12:24 AM   #19
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even number: intersection points of the blades line up radially with the point opposite (overlaps), so the # of light rays equals the number of blades.

odd number: intersection points are offset resulting in double the number of light rays.

someone else can say it better but for example:
6 blades = 6 pt stars (ugly)
7 = 14 pt
8 = 8 pt
9 = 18 pt
etc

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