How to photograph the Orion nebula

First of all, we have a general understanding of the Great Orion Nebula (M42, NGC 1976), which is a reflection nebula located in Orion. It was discovered by the Dutch astronomer Huygens in 1656, with a diameter of about 16 light-years and an apparent magnitude of 4 1500 light-years. The same position is also under the name of China. Orion Nebula is a huge cloud of gas and dust, which is producing new stars in space.

It is a luminous gas cloud in Orion, just visible to the naked eye in the middle of Orion's sword. The nebula is connected with a star-forming region and illuminated by the young stars it contains, which is very spectacular in astronomical photos. Orion nebula is also one of the indicators to identify Orion; Orion Nebula is one of the most important objects photographed by astrophotography enthusiasts and large telescopes of the Observatory. 1September 30, 880, Henry? 6? After 65,438+05 minutes of exposure, draper successfully photographed the nebula next to the Orion Quadrant. Now we can shoot the pink light of Orion and Orion nebula for five minutes with a wide-angle lens camera. Equipment So for your equipment, 500D+600 decided that in order to shoot the optical system to accurately follow the movement of celestial bodies, you need to buy an electrically driven equatorial telescope. (Because it usually takes a long exposure to track celestial photography, if you want to take a "real" image of the celestial body, you must follow it with the help of the equatorial camera, that is, let the optical axis of the photography system rotate synchronously with the celestial body. ) Canon 500D SLR camera is equipped with B-door and reflector pre-lift function, which can control the exposure time within a few minutes, and the noise problem can be basically controlled. You should also need a complete set of star guiding equipment when observing. (While exposing deep space for a long time, it is necessary to make some corrections to the tracking accuracy of the equatorial plane, that is, the guiding star. We need a star guide telescope with large magnification, which is convenient for accurate star guide. A stellar navigation telescope, a special stellar navigation eyepiece or laptop. Selection of environment and weather: First of all, we must find a shooting location without light damage under clear and cloudless weather conditions, and we can't take celestial photography when there is wind, which will make the camera shake violently and lead to blurred images. Looking for Orion: The viewfinder of a SLR camera is affected by the small aperture of the lens, and the target may not be seen at all. You need to use coordinates and star maps to help determine the location of the target. There is a coordinate ring on the equatorial plane. If you can find a star with known coordinates from your 600-degree fixed view, check the coordinates of this star. Then you can use this confirmed coordinate ring and the coordinates on the catalog to find out the celestial body to be photographed. You can also compare the relative position of the target on the star map with the bright star, and then use the star finder to find this position. Nowadays, many equatorial planes can automatically find the shooting target through computer software control. Tracking Orion: Astrophotography is more than just aiming at the polar axis. Just connect the camera and press the shutter. Because of the rotation of the earth, it must be tracked by the equatorial plane. However, there will be errors in the operation of the motor and the correction of the polar axis of the equatorial telescope, which will all appear in the photos. Find a bright star near the photographed Orion through the star guide mirror, put it in the field of vision of the star guide mirror, and lock the star through the computer screen from the beginning to the end of the exposure to correct the deviation you see (that is, the error of the equatorial telescope). This is the first picture. The longer the focal length, the more careful. Press the shutter: Canon 500D digital SLR camera shooting is like a double-edged sword, which has advantages and disadvantages, because its photosensitive device is highly sensitive and will not have the problem of "reciprocity failure" like the traditional negative film machine. You can also see the effect immediately through the computer, and the post-processing is easier. However, long exposure will produce strong noise in the photos. (You can take a few photos exposed for a short time and stack them into one, so the noise is obviously less. Small details of camera setting: RAW format, ISO setting as low as possible, and color temperature can be adjusted at any time. For long exposure, use the mirror pre-lift function. Before opening the shutter, block the optical system with a black cloth, open the shutter with your cable release and lock it to ensure that the whole system will not vibrate. Tips and precautions written at the end: shooting location, weather conditions, selection of equatorial plane, accuracy of polar axis, accuracy of camera and lens are all prerequisites for shooting a good photo of tracking celestial bodies, and the shooting steps are orderly; Don't walk back and forth often, don't touch the equatorial plane, and it is forbidden to interfere with the light. If you like smoking, you should also smoke far away. When shooting, two people worked together. Your good friend focuses on guiding the stars. If you encounter a strong wind or a small mistake in guiding the star, he will help you block the optical system. Don't think that the focal positions of celestial bodies are all the same "infinity", and the focal positions of the moon, planets, sun and stars are all different. 600 fixed focus belongs to long focal length, the longer the focus, the more careful it is. The humidity is high at night, so it is necessary to have a good UV lens in front of the camera to block the dew and hang a hand warmer. Summary: Although astrophotography is troublesome, it is not too difficult. With confidence, perseverance and equipment, you can shoot good works.