Photography strategy of Daquanshi in the Yangtze River

The total solar eclipse, which only happens once every 300-400 years, will certainly leave some precious memories, such as photography and video. Maybe one day after 300 years, your descendants will point to the photo and say to visiting friends, "Well, this is a photo taken by our predecessors 300 years ago!" " I believe that many people are already sharpening their swords for the upcoming total solar eclipse, and they are all ready to show their skills on the "black phase". The author is also a photographer, and I provide some eclipse photography skills for your reference. 1. Never point directly at the sun, or it will burn the camera CCD or CMOS. This is the same as the principle of retinal burn in human eyes irradiated by strong light.

2. The phase of partial eclipse must be filmed by dimming film and Budd film. You can also shoot with eclipse glasses in front of the camera.

3. Remove the dimmer during the total solar eclipse and shoot directly at the sun.

4. Be fully prepared in advance. For example, step on the spot a few days before the total solar eclipse and try to shoot at the same time.

Direct shooting method:

During the total solar eclipse on July 22nd, 2009, the horizon angle of sun gear was very large, so it was difficult for even a wide-angle camera to capture the ground scenery and sun gear at the same time. Therefore, if the main purpose is to shoot sun gear, we have to give up the scenery on the ground.

2. Try to use a telephoto lens. The diameter d of the sun gear image in the photo is proportional to the focal length f of the objective lens (d=0.0093F). For example, when the focal length is 1000mm, the diameter of sun gear image on the negative film of 135 is1000 * 0.0093 = 9.3 mm. For another example, the size of sun gear image with focal length of 50mm is 0.5mm, and the size of sun gear image with focal length of 50mm is1. I am an analogy.

3. Be sure to use a tripod. It is best to release the cable to prevent the vibration caused by pressing the shutter by hand.

4. The partial eclipse lasts for a long time, so you can practice focusing repeatedly to avoid leaving regrets when the total solar eclipse arrives. Of course, focusing is an experience, and there is no shortcut.

5. the subject. Food: Bailey beads, diamond rings; Food: Corona and prominence. The process of Bailey bead is short, full of changes and quick response. It is best to turn on the continuous shooting function of the camera. In addition, the famous "Eclipse Sugar-Coated Berry" can be shot by multiple exposures, which requires higher skills.

The following is the "Eclipse Photography Exposure Table" compiled by relevant people, which has high reference value. Of course, in the actual shooting process, it is not necessary to strictly abide by this exposure meter, but to make corresponding choices according to the weather, light and other on-site conditions of the day. A solar eclipse is a typical example of light traveling in a straight line in a celestial body. When the moon moves between the sun and the earth, it is not always like this. When a lunar eclipse occurs, two conditions need to be met. First of all, the solar eclipse always happens on the first day of the lunar calendar. Not all eclipses will happen on the first day of the lunar calendar, because the orbit of the moon (ecliptic) and the orbit of the sun (ecliptic) are not on the same plane. There is an included angle of 59 between the ecliptic plane and the ecliptic plane. On the first day, if both the sun and the moon move near the intersection of the ecliptic and the ecliptic, and the sun and the intersection form a certain angle (eclipse limit), an eclipse will occur, which is the second condition to be met.

Because the orbits of the moon and the earth are not perfect circles, and the distance between the sun and the moon is near or far, the shadow formed by the sun being blocked by the moon can be divided into umbra, pseudo-umbra (formed when the moon is far away from the earth) and penumbra on the earth. The observer can see the total solar eclipse in the umbra; Annular eclipse can be seen in the range of pseudoumbra; Only a partial solar eclipse can be seen in the penumbra.

There are many mountains on the surface of the moon, and the edge of the moon is irregular. At the moment of the lunar eclipse or the arrival of light, when the valley on the edge of the moon fails to completely cover the sun, the uncovered part forms a luminous area, like a crystal diamond; The reddish aperture around constitutes the "ring" of the diamond ring, which looks like a diamond ring inlaid with bright gems. Sometimes a lot of particularly bright lights or spots are formed, like a string of pearls embedded around the sun. This phenomenon is called Bell Pearl (Belle is a French astronomer).

Whether it is a partial solar eclipse, a total solar eclipse or an annular solar eclipse, the time is very short. The area where the solar eclipse can be seen on the earth is also limited, because the moon is relatively small and its umbra is relatively small and short, so the umbra will not sweep the earth for a long time. Because the average length of the umbra of the moon (373,293 kilometers) is shorter than the average distance between the moon and the earth (384,400 kilometers), there are more annular eclipses on the whole earth than total solar eclipses.