First to a Galaxy map town posted! 
I have been playing for more than three years, and I have been tossing too many lenses. Now I'm too lazy to choose only the lens that suits me. I chose 16-35VR for general scenery and 80-400G for telephoto shooting. Using the Sigma 35 1.4 for portrait shooting and M50 1.4a for documentary street sweeping, Sigma 20 1.4 was used to shoot Galaxy. Other topics were not considered.
As a lens for more than six months of listing, Aunt Zhang did not actually see the use of evaluation? It seems that this lens is really too small, so I'll say how I feel about using this lens. For me who like scenery photography, Galaxy is an indispensable filming theme. I photographed the Galaxy from the beginning of 13 year, and now I have used Sanyang 14 2.8, Canon 24 1.4, Nikon 16-35, Sigma 20 1.4 and so on. Lens. This camera has been used for Galaxy shooting since it was purchased in May of this year in May. This is a very good shot. My position for this lens is to shoot Galaxy artifacts. However, I would like to emphasize that this shot was only used to shoot the Galaxy and did not shoot other subjects. I can only talk about the feeling of shooting the Galaxy.
Sigma 20 1.4 is a light bulb head, the hood can not be removed, probably not on the filter, so be careful when using it!
As an ultra wide-angle large aperture lens, the S20 seems to have been born for the Galaxy. Scene photographers all know that shooting the Galaxy requires the lens aperture to be as large as possible (the larger the aperture, the more stars are photographed), the wider the focal length (the wider the focal length, the more pictures are taken), so most of them will There are two kinds of choices, one is the pursuit of large aperture, such as shooting with a lens such as 24mm F1.4 (because it is not very likely to need to take a piece), the other is the pursuit of wide-angle, use 14-24mm F2.8, 16 Shooting with a 35mm F2.8 lens (seeking a wide field of vision). Now that the Sigma 20 1.4 is on the market, the super wide angle and large aperture can be perfectly unified. It is really a tool for photographers!
I purchased the Sigma 20 1.4 lens on May 13, 2016. The shooting of the Galaxy began the evening of the same day. From May to today, a total of four galactic shootings were conducted. The summer of each year is the best time to shoot for the Galaxy. I also made a lot of works during this time, and then I share my shooting experience with you. .
The first photo taken with S20 was taken in the Xiaocaohu wind power area near Urumqi, Xinjiang, on the early morning of May 14. Because it is a large aperture of 1.4, I can rest assured that with ISO1600 even lower sensitivity, so that better picture quality. At the same time, according to the Starry Sky 500 rule, 500 divided by the focal length 20 equals 25, which means that my maximum exposure time should be 25 seconds (too long the stars will drag the track), but according to my field shooting situation, even 15 Second exposure, there will be a little drag track after zooming in, if the demand is harsh, the longest exposure time should not exceed 13 seconds. The shooting of the Galaxy is very simple. First of all, you have to see the Milky Way with your naked eyes. Then you go on a tripod and shoot the camera on the Galaxy. It's easy to shoot. With regard to focusing, my method is to adjust to MF, which is the manual focus mode, and then turn on the camera's LED screen, live view mode, zoom in ten times, find a brighter star, and turn the focus ring to focus manually.
The light pollution in this place was very serious. I took a picture of the panorama of the Milky Way, but it was not very good-looking. The light pollution is very serious. The Galaxy is not clear. In short, it is a waste film.
Afterwards, we went to Turpan Desert in Turpan to photograph the Milky Way. Because there is no light and the weather is good away from the city, the photographed drink is very clear.
The following picture was shot with the hand, and the memory of the commemorative one pass did not fall asleep just to shoot the Milky Way, the light source was the led light bar, the left was my camera, the D810 + Sigma 20 1.4 + Gitzo GT3532LS + RRS BH55, and the right was the camera of a friend , 5DSR + EF24 1.4II + Gitzo 2 Series + Ma Road PTZ.
From the RAW point of view, the Galaxy captured by the 20s F1.4 ISO1600 is very clear, we can choose a lower ISO to shoot according to the brightness of the specific environment, so as to achieve a more excellent picture quality.
The end of this shooting in mid-May, the number of films that can be seen is so few. This trip is not perfect, and no good film has been produced.
The second time the Galaxy was filmed on June 2nd, went out at 7:00, went to Urquim City 150km away to take a picture of the sunset, then started shooting the Galaxy around 12 o'clock. After the end of the filming, he arrived home at 5 am and had to go to work during the day. I'm pretty good at it, but isn't photography like this? It was hard work to capture good-looking scenery. What's more, I just took pictures from a place not too far away from home, and I'm more than happy.
The sunsets of Devils City did not capture any good-looking films. Not to mention them (and not the S20). At 0:30 or so, they started shooting the Milky Way. There was a derrick, and I thought of a theme, Derrick + Galaxy, It will definitely look good.
Well, you read it right. I used ISO64 to shoot (the minimum non-extended speed of the D810). Before I took this film, I was thinking, saying that I would like to shoot the Galaxy to have a high iso, so can I shoot with a low ISO? Come out? It turns out that this is no pressure. Zoom in and the picture quality is very good.
Afterwards, we photographed the Galaxy in the nearby Populus euphratica. As a prospect, Populus was a very good idea.
Also mentioned here, or off-road vehicles easy to use, the side of the Populus euphratica is not very easy to go, and you can let the car current scene, but also very handsome! (I really do not advertise!)
We can see that the picture quality of the sky is very good, noise control is very good, and the stars are bright. Because of the large aperture of 1.4 and the exposure of 20s, we can safely shoot with lower sensitivity. But I think that in order to avoid the brightness of the ground, or try to use high iso, I only do this to challenge the limit of shooting the Galaxy is low.
The third filming of the Galaxy was on June 24, and the Galaxy was photographed near Yumin County in Xinjiang. The following picture is taken in the wild fruit forest, there is a small waterfall here, but I am not technical, did not make a very good photo, composition, selection is not good enough.
Later we headed to Yumin County to photograph the Milky Way near the border. When the sky was not completely dark, the Galaxy was not very good-looking. Even if I adjusted the white balance, the color of the Galaxy was still ambiguous and there was a feeling of magenta.
The plants here are not very good looking. The plan was to shoot Hua Hai. It seems that there is no chance. Fortunately, we have prepared steel wool. There is a search for online play of steel wool, and here I am not popular.
If you don't have a good-looking outlook, you shoot the camera against the sky.
Beware of the Galaxy. When the moon comes out, although the ground will be bright, the Galaxy will be less obvious. For example, I use the current scene of the car and flash a light. The effect is still good. The one on the left is the moon, not the sun. Do not make mistakes. 
After that, the moon is getting higher and higher, brighter and brighter, and the Milky Way is hard to see. Then we go back. On the way back to the hotel, I took a prairie and I took a photo by the way. The effect was fine. The Galaxy could still see clearly. As you can see, in the case of the 20s F1.4 ISO800, in the case of moonlight, you can shoot the night very brightly. This bright night-time photo that looks like a daytime, I think it is also very interesting.
Zoom in to 100% to see the local details, the quality is still possible, I personally can accept. Because I was focusing on the Galaxy, I might be a bit off the ground.
Once again commemorating the next three or four consecutive days, the cameras that patrol the Galaxy every day.
On August 29, invited by a friend, he went to the border county Jiminana to play. There is a stone city on the other side. It is very beautiful, with huge rocks and rocks, and it is magnificent. This kind of scenery used to shoot the Galaxy is simply awesome!
The first two films taken during the day
D810+16-35VR
D810+80-400 five tabs
Here the scenery is very good, it is suitable for taking pictures, of course, this is not the key, the key is that we have finished the dinner, go out to hang the bombing of the sky, see the stone behind it, this location to shoot the Galaxy is so beautiful!
First take a photo of the yurt. The Kazakh friends are still very enthusiastic and the food is delicious. Of course, this is to spend money.
Then take a shot of the Milky Way with this big stone as the foreground.
It is a very good idea for people to walk past and turn on the flashlight. It is recommended that everyone try it.
Before I left, I had to take a picture of the car. After all, we couldn't come to such a good place without a car. But this time it was Qi Chun who was worse than the Wrangler.
This article is nearing the end. From a personal point of view, I am very satisfied with this lens. It can be said that I am currently using the highest frequency lens. Shooting the Galaxy, this lens is enough. Finally, the advantages and disadvantages of this lens are discussed.
advantage:
Aperture is large enough
The focal length is wide enough
Sharpness is very good
Disadvantages:
Dark corners are heavy
Quality control slightly worse
Bulb head is easily scratched
The function is too single. In addition to taking Galaxy, other types of photos have better shots for you to choose from. The scope of application is too narrow.
PS: All of the Galaxy photos taken here are shot on the Nikon D810+ Sigma 20 1.4. They are all single shots, without a composite or stack. In the latter part of the game, only the LR software was used for simple processing such as exposure, white balance, and contrast clarity. There was no complicated post-production and PS software was not used.
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