Using SLR for astronomical shooting, which astronomical telescope is good for middle and low level?

To put it simply, on the surface of the moon, planets need telephoto binoculars, and shooting deep-space nebulae needs short-focus binoculars. Shooting nebulae with short-focus requires long-time exposure and high-precision equatorial telescope, and your budget is far from enough. At this price, it is recommended that you shoot the moon and planets with telephoto binoculars, only a tripod is needed, without equatorial telescope, and a magnifying lens is needed. Two times is enough, and it is recommended to start the 8-caliber general elimination within 15. You mentioned chromatic aberration. The chromatic aberration can only be controlled by a large focal ratio at a low price, so give up the nebula. If you really want to photograph the nebula, the budget should be at least 6, yuan. If you don't understand supplementary questions, remember to give points.