According to astronomical calculations, from November 29 to 30, 2019, at about 5:20 pm, the "Four Stars and Pearls" officially debuted. What does this mean? Let's first take a look at what is a four-star string?
Four-star beads are an astronomical phenomenon that refers to the fact that when the planets are lined up in a straight line on the same side of the sun, they are called planetary beads.
Nine-star beads are an extremely rare phenomenon in astronomy, and astronomical phenomena such as nine-star beads occur once every 300 years.
According to the calculation results, from November 29 to 30, 2019, at about 5:20 pm, the "Four Stars and Pearls" officially debuted. From the earth, I can see "one, two, three, four stars in a line."
The four-star beads are also very different from other astronomical observation methods, it does not require special instruments to see, as long as the naked eye can.
Interested friends can go to the field to observe, avoid the pollution of urban light sources, and can be seen with the naked eye or binoculars.
Here we talk about light pollution, what is light pollution, in the field of photography, light pollution has a greater impact on astronomical (starry sky) photography, first look at what is called astrophotography, look at light pollution.
So what does light pollution look like? Looking at the following figure, there are white, red, and yellow rays of light in the sky, which is light pollution, which interferes with our observation of the stars in the sky, which is a very unfavorable factor for astrophotography.
<h1>So where is there no light pollution? </h1>
Far from the city lights, such as villages, mountains, deep mountains, these places are sparsely populated, less modern facilities, in these places to see the sky, you can see a lot of stars, if we use a SLR camera to shoot, you can take the following picture.
Four stars are coming, astrophotography enthusiasts, do not miss this opportunity, find a good place in advance, set up a camera, waiting for shooting, then I will bring you astrophotography shooting methods and suggestions.
Preparations for astrophotography
Equipment preparation: First of all, you must bring a camera and a lens with a large aperture, and choose the lens with the largest aperture in your hand.
Astrophotography requires the use of long exposure shooting techniques, so the tripod must be brought, this is indispensable, handheld is easy to shake, blurred.
Venue selection: Avoid light pollution environments, if you live in the city, driving to remote mountainous areas is the best way to shoot, which is what astrophotography enthusiasts know.
Camera settings and calculations
The camera chooses a manual transmission, and the exposure time is controlled to ensure that the stars are not turned into star tracks. Let's take a look at what the star orbit is as shown below.
We can calculate the 500 rule, the method is very simple, the exposure time is less than or equal to 500, divided by the lens focal length. For example, the focal length of the lens is 18 mm, and the 500 divided by 18 is about 27 seconds, and the shooting time cannot exceed 27 seconds.
As mentioned earlier, why should I have a large aperture lens, because the larger the aperture, the more details of the starry sky can be shot, and the lens above F2.8 is generally selected to shoot, and the minimum must not exceed F4.0, otherwise the effect is very poor.
The sensitivity also needs to be adjusted, usually, the sensitivity should be set at about 3200, up to 6400, shooting the starry sky at night is no problem, we can use the software to reduce noise processing.
Focus
In terms of focus, we have to set the manual focus mode, adjust it to infinity, can not shoot with autofocus, there will be a blurred focus or can not focus. Most lenses have a logo on them that lets you know that the lens is already infinitely far away. The "L" or "I" on the lens focus ring.
Turn off stabilization
When using a tripod for long exposures, you need to turn off lens stabilization, which can prevent the camera and lens from stabilizing enough, and if you don't turn off stabilization, blurry photos will also appear, so remember to turn off stabilization.
As long as you master the above methods, go to the squat point to shoot at night, maybe this photo can let you take away the grand prize of astrophotography, don't miss the opportunity, try more composition and angles, and use your imagination to create it.