What camera is used for celestial photography?

Look at the photos of Mu Fu, the largest astronomical forum in China, which are basically taken by Canon! Canon retains the original information, and the exposure noise is lower than Nikon's, so Canon's SLR is recognized as an astronomical machine. Unless the star field, celestial photography is usually taken with a telescope. If Hoshino is shot with a wide angle less than 15mm, even a fisheye lens is needed. If the nebula is photographed, the focal length will exceed 600 mm. This kind of lens is not affordable for ordinary people, and it is usually replaced by a telescope, so there is no need to consider the lens problem. Because of the telescope, there is no autofocus metering. 450D or 500D is enough. The new noise is higher than the old one, which is not conducive to astronomical photography. It's better to have money to buy 5D2. 1D continuous shooting has advantages in focusing, but it's not needed for astronomy, but the picture quality may not be as good as 5D2. It was a little difficult to shoot astronomy with a film machine at first. The key to shooting deep space is not camera, but equatorial plane. If you only shoot the Milky Way with a wide-angle lens, the equatorial plane doesn't need to be too accurate. If you want to shoot a nebula, the equatorial plane investment is even higher than that of the main mirror, and the lowest cost of the camera only accounts for 1/4 of the whole system.

The first thing that celestial photography needs is a telescope head. More than 500 can shoot the moon or something. It's best to use an astronomical telescope. You can shoot some nebulae or something with 1200. The camera needs to have an interface with the astronomical lens, just through the interface. There are several requirements for cameras. 1. There must be a B gate or a T gate to realize long exposure. 2. It must be low noise. Generally, low-temperature cooling and modification are needed to solve the problem of CCD heating and noise caused by long-time exposure. 3. When shooting some nebulae, it is necessary to remove the infrared filter in front of CCD to ensure the full-color image of nebulae. 4. Automatic orbiter, which can track the trajectory of the planet. Burning celestial photography also costs money. Hehe, I need money, and I have to go to places far away from the city and the top of the mountain to make good films. It is not easy. General digital SLR can be modified to shoot. Machines under 2000 yuan can only be shot for one month, and can't go any further. Anything with a far focus of more than 400 is ok, and it is better to add a double mirror or something, but it can only be played at a small level.