What configuration of camera is suitable for taking pictures with astronomical telescope?

Resolution means the ability to distinguish the details of the target, which is expressed by the opening angle limit of the details of the target, generally about seconds.

Resolution = 1.22λ/d

Magnification = f (objective lens) /F (eyepiece)

Focal length ratio = f/d

Generally, the maximum resolution of 70mm~80mm aperture is about1.6 ",and you can see the Moon Crater, Venus Profit and Loss, Mars Polar Crown, Muxingyun Belt, Saturn Halo, Uranus and Neptune with a diameter of several kilometers. Theoretically, you can see all the 1 10 deep-space objects in messier, but due to various problems such as operation, environment and observer level, it is very good for beginners to see more than a dozen messier objects. In the case of nebulae, only Magellan Cloud and Andromeda M3 1 nebula (actually galaxies), Orion Nebula M42, Taurus Pleiades Cluster M45 and Cancer Ghost Cluster M44 can be seen. If you can use it in the wild without any light interference, you will see more things, such as the nebula M8 and M20 in Sagittarius, and the globular cluster M 13 in the constellation Pentecolus. But what I see is basically a fuzzy white dot.

Telescopes with large focal ratio are suitable for observing deep space objects, while telescopes with small focal ratio are suitable for observing solar system objects. Generally, the focal ratio of 10~ 12 is more suitable for beginners to observe. This focal ratio is moderate, and you can look at far and near celestial bodies, and primary observers are enough. If you have a certain stargazing foundation after a while, you can buy a better one.

Celestial photography needs to be equipped with high-level equipment, such as advanced equatorial telescope, APO apochromatic telescope, frozen CCD, automatic star guidance system and so on. Such a set of equipment needs at least 30 thousand yuan. If there is no good equipment, you need to improve your operational ability. Simple photography can be completed with 80mm achromatic, simple equatorial camera and Canon 350D SLR. Such a set of equipment is about 6000 yuan, but it needs to be modified by the landlord himself, especially the use of equatorial camera. The specific operation is responsible, so I don't want to go into details here. It is suggested to consult Mufu Astronomy Forum or Baidu Astronomy Bar, so that real-time communication is more convenient.