 - Donna K. Kilcher  Contact Donna K. Kilcher Donna K. Kilcher's Gallery |
warped sun?
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Alan N. Marcus |
Hi Donna, To reach earth, light from the sun must transverse the earth’s atmosphere. Air acts like a lens and bends (refracts) light just as glass does. Draw a model of the earth and then draw another circle around it to represent our atmosphere. The top of our atmosphere is about 100 miles high. At noon the sun is directly overhead so the sunlight transverses air for distance of about 100 miles. When the sun is low in the sky, the light must travel through the air as before plus an extra 20 miles, as that’s the extra distance to the horizon. Since air acts like a lens it distorts the circular shape of the sun. When the sun is seen close to the horizon the sun’s disk appears to be oval and not a circle. This is due to the lens like refraction of our atmosphere. Also the temperatures of the winds aloft affect the light’s path. Cold air is more dense than hot. The effect is so severe that at sunset, when you see the sun on the horizon, it has already set. Navigators when using the sun to find their position must take all this into account or their calculations as to where they are on a map are in error by many miles. Keeping look up and keep wondering. The world and the universe is full of wonder. Alan Marcus
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Samuel Smith |
well,focal length and aperture? makes a big difference on what you wish to capture. sam
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- Donna K. Kilcher Contact Donna K. Kilcher Donna K. Kilcher's Gallery |
they were taken in the early morning..... and My f stop was 4.5 for both, the first focal length was 55 and the second was 48
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Jon Close |
There is too great a dynamic range of exposure between the sun and the rest of the photograph. The sun is completely overexposed and "blownout". When this happens, the overexposed pixels tend to "bleed" into the adjacent receptors. Due to the design of the digital sensor, its microlenses, and the Bayer color filter over it, this bleeding into nearby pixels isn't uniform so the blown-out sun stretches into an oval rather than a larger circle.
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Michael A. Bielat |
Those other guys explained everything very well and that is what is causing your issue.
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Samuel Smith |
i agree almost completely with jon.but I have a degree of confusion that at f22 it may be saved to a small degree at the right angle.
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