How to shoot the star track with a mobile phone?

Shooting the orbit of stars is not as simple as taking pictures at ordinary times, and the choice of shooting time, date and location environment is also particular. Summer and early autumn are the best dates. In these two seasons, the sky is long and the moon rises late, which will not affect the brightness of the stars. When the fifteenth lunar month is full, the moon's light is so bright that it can almost light up the sky. It is almost impossible to take pictures of the starry sky on such a day, so we should choose five days before and after 1 lunar month. That is, the first day of February 1 to the fifth day of February 5. The best shooting time is between 10 and 2: 00 midnight.

Due to the serious air pollution, the visibility of the starry sky is affected. Therefore, the shooting location generally needs to be far away from the suburbs of the city, and the surrounding environment is as empty and dark as possible. Try not to be affected by stray light from the surrounding environment for a long time, such as car lights and street lamps, otherwise the photos will be overexposed for a long time.

Besides, you need to prepare some necessary software and hardware. Because it takes a long time to expose the orbit of a star, you need to prepare a tripod and a mobile power supply. In order to find Polaris more conveniently, it is best to download a Google Sky Map software on your mobile phone. If all these are ready, then you can shoot below.

If you are shooting the starry sky, you need to use idol instruments, set up your mobile phone, aim at the starry sky you need to shoot, regardless of the position of the North Pole star. Idolated instruments will continue to track the photographed stars, and mobile phones will continue to be exposed. There is an advantage of shooting stars with Nubian mobile phone, which can preview in real time, what you see is what you get, and keep abreast of the exposure. Exposure is enough, usually a few minutes.

Shooting the orbit of a star requires finding the position of the North Pole star. You can find Polaris through Google skymap software prepared in advance (experienced people can also find Polaris through the Big Dipper), and then point your mobile phone at Polaris. Through the rotation of the earth, the orbit of the star you photographed is a concentric circle. If you don't point your mobile phone at Polaris, you can't shoot a complete circle.

It usually takes a long time to photograph the orbit of a star, and it is necessary to choose the appropriate time according to the obtained orbit length of the star, such as 10 minute, 30.5 hours, 1 hour, or even several hours. At first, due to the short trajectory of the star, an arc similar to a meteor shower was photographed. According to the knowledge learned in geography class, the earth rotates at an angular velocity of 15 per hour, and the length of the arc formed by the orbit of the stars on the screen can be basically estimated. The closer to the center of the circle, the smaller the linear speed of rotation and the shorter the arc formed, and vice versa.

Because the shooting time can be as long as several hours, the orbit mode of nubia Z7 max is to take a photo every other minute, and then combine these photos into one through internal calculation to get the orbit photos we see. In the past, some users used a camera with "long" exposure function to take multiple photos at the same position at intervals, and then synthesized them by computer software, and they could also get photos of stars and orbits.

One of the advantages of using nubia Z7 series mobile phones to shoot the star track is that users can check the shooting time and exposure effect in real time through the screen and choose to stop shooting. The photos taken by some friends are not transparent enough because of air pollution. You can use computer software to adjust the contrast of the picture.

You can use computer software to adjust the contrast of the picture.

It is not difficult to shoot stars in orbit, but there are also some things to pay attention to. In addition to the work to be done in the above preparation stage, when shooting, the shutter should be opened and closed lightly to reduce vibration. It is best to connect the mobile power supply to the mobile phone before shooting, and try to avoid any factors that cause equipment jitter during shooting. Because the shooting location of the star orbit is generally in the wild, and it is at night, so pay attention to safety. In addition, we should also take into account the possible wind, rain and thunder at night.