Star shooting skills and experience
- Dec 11, 2019
- 1 Comment
In the digital era, due to the limitation of digital technology, long-time exposure results in CCD / CMOS heating, which produces a large number of hot noise. More than 10 minutes of exposure, more noise than stars. Nowadays, thanks to the continuous innovation and upgrading of noise reduction software and the emergence of new technologies for sensitive elements, the noise problem that plagues the long-term exposure of digital cameras has also been effectively solved. In fact, there are various ways to play in the vast night sky. After reading this small tutorial, what is lacking is imagination.
I. equipment preparation
In addition to the camera and lens, you need to take a tripod / shutter line / two powerful batteries / flashlights; if you can't find a star, you need to take a compass.
1. Compass (Compass is OK): first of all, find the direction, determine the shape of the star trace in your composition. Facing the north, you can take a picture of a circle of stars with Polaris as the center; facing the northeast or northwest, you can take a picture of a fan-shaped group of stars. As for why this phenomenon occurs, please read the relevant junior high school geography textbooks. 2. Tripod / shutter line: a stable tripod and pan tilt combination, as important as the camera and lens. If the camera moves during a long exposure, you will lose all your previous achievements. The shutter line is mainly used to lock the B door. If you don't know what the B door is, or your camera doesn't have a B door, please don't look down. 3. Two batteries with full power: one is installed on the camera and the other is for standby, because it takes a long time to shoot the orbit, one hour, or even several hours, or to shoot the daylight. You need to observe the power at any time, and then determine your exposure time or change the battery. 4. Flashlight: on the night of high wind and dark moon, the flashlight is everything. It helps you find your way home, light up, focus, etc. the camera can not be taken, but the flashlight must be taken.
The continuous exposure time is about one hour. Using a 14mm lens, f 3.2, ISO 100, facing the north, a circular star trace is obtained
2. Choose the right weather and time to get the best image.
Choose the sunny night before and after the 4th day of the lunar calendar, to the countryside and the top of the mountain far away from the city, and you can't see five fingers, which is the best condition to ensure the success rate of shooting. Can you shoot at any other time except the first day and the 30th day of the lunar calendar? Yes. When you have considerable experience, you can use multiple exposures, hundreds or more photos to synthesize a rare work.
From night to day, the composite image after segmented exposure recorded three hours of star shift in one image.
Focus and composition
1. Composition: it's not difficult to focus and composition in the dark night when you can't see your fingers. First, set the camera ISO to 6400 or higher. After shooting, use the camera display screen to play back, check the location layout of the scene, and adjust the composition repeatedly. After composition, remember to adjust the ISO back to the normal value of 50-200. 2. Lens focusing: first, focus on infinity. For wide-angle lens, this is a simple method of focusing. To focus on the foreground or near scene more accurately, first light the focused scene with flashlight, and complete the focusing by reference to the brightest part (manual operation is recommended).
4. Camera setting and long time exposure shooting.
1. Camera setting: first, turn off the long-time noise reduction setting, because the noise reduction time of the camera is as long as the exposure time, such as 60 minutes of exposure, and 60 minutes of camera noise reduction time, which takes 2 hours in total. Generally, the single battery on board is difficult to support, and the power is cut off halfway, with serious consequences, so don't take risks, and put the noise reduction work to the later stage. 2. Lens setting: with a large aperture, the thicker the star trace is, the thinner the star trace with a small aperture is, and the aperture setting should be as large as possible; f2.8-f4 is better, to ensure sufficient light input and obtain significant star trace. 3. Exposure time: the longer the exposure time, the longer the track. It can also be divided into short-time exposure and multiple post exposure synthesis. If your camera does not support long-time exposure, or you have enough post production ability, you can try multiple exposures. 4. Multiple exposure: first of all, you need a shutter line that can automatically control the exposure time, the number of shots and the frequency of shots. It is set to automatically take one shot every 1 second. Each exposure time is 2-4 minutes, and the number of shots is 30. You can also get a Star orbit work with a total exposure length of 60 minutes. It must be remembered that the ISO setting should be increased by 500-800, not to mention the reasons. You have several failures The next time. Comparison of wide angle shooting cases:
The length and thickness of the star trace can be controlled by the focal length and aperture of the lens, and the fan-shaped star trace can be obtained towards the northwest and northeast. Use 24mm axis shifting lens
V. photography skills of galaxy and Nebula
Mastering the orbit shooting, the shooting of the galaxy nebula is a pediatrics. Having a camera with high sensitivity is omnipotent.
1. Use the same equipment and accessories as shooting star orbit. ISO is set to 1600-3200 or higher, and the exposure time is controlled between 50 seconds and 30 seconds. The shorter the exposure time is, the clearer the nebula will be. Of course, your camera needs to have better high-sensitivity noise control ability. When photographing the galaxy nebula and photographing the orbit, the exposure parameters match in the opposite way. The high sensitivity is to shorten the exposure time. When the exposure time is long, there will be an obvious track, and the galaxy will be atomized, so the shorter the exposure time, the better.
2. To photograph the Milky Way nebula, we need more transparency of the atmosphere and darkness of the environment. The samples in this paper are taken in high altitude areas or grasslands, far away from light and air pollution.