Can the 4000 telescope see the nebula constellation in the city?

Generally, you don't need a telescope to see the constellation, but you can't see it with it. Although the telescope can help you see some stars that are invisible to the naked eye, the constellations are very large, and the field of view of the telescope is very small, so you can't see all of them. There are also telescopes dedicated to looking at constellations, but they are all very small, so this telescope can't see nebulae.

There are two main factors in looking at nebulae. One is to observe the environment. If the environment is too bright and the background brightness of the skylight exceeds that of the nebula, then no telescope can see it. This requirement is difficult to meet in cities. Basically, only particularly bright star clouds like the Orion Nebula can be seen. If the observation environment is good, there is no light pollution and the sky is dark, then whether you can see the nebula depends mainly on the telescope's light collection ability, which is determined by the telescope's aperture. 4000 yuan can buy 150mm Newton reflecting telescope, commonly known as Xiaohei. In a good environment, you can see some common nebulae (such as messier objects). But don't expect too much. Even if these nebulae can be seen in a telescope, they are just a faint mist, and it is difficult to see any details.