I want to start with the astronomical telescope, 1000 to about 5000 yuan. Is refraction good or bad?

Choose an astronomical telescope to see what celestial bodies you want to see, mainly vision or astrophotography, and budget.

Meade brand is good, but ETX-80AT-BB has automatic tracking, 80 caliber and 400 focal length. If it is used to see the planet, the estimation is not enough, mainly because the focal length is too short, and it is still very small to see the planet with a short focal length eyepiece. It is also possible to look at the deep space such as the Milky Way Nebula. If you want to take deep space photography, you must go to Ed ·APO's refracting telescope. The 80-caliber primary mirror is more expensive than 4K, and the equatorial telescope and star guidance system with accurate tracking are also expensive. You can also choose the reverse direction of cattle, which is more cost-effective, that is, bigger; Another option is the Marca mirror, which has a short focal length and is conducive to seeing the planets and the moon. The price is more expensive than cattle. Marca mirrors, such as Xingtelang NexStar 4SE, have an aperture of 100mm, and also have automatic star finding function. If you don't need automatic star-seeking photography, you can choose the bull's-eye of the ordinary equatorial telescope and choose a large aperture on the basis of the existing budget. For example, SkyWatcher 10 inch 254/ 1200 parabolic telescope DOB mirror is only in its early 4K, with a diameter of 254 mm, and the effect of seeing the planets and the moon is absolutely shocking. The catadioptric refraction of 80 caliber absolutely surpasses the dust, and it can also take care of nebula clusters with small focus. DOB bull is suitable for visual inspection, and there will be tracking problems if photographed. Of course, photography like planets and the moon is still possible, because they are brighter and don't need long exposure. To track accurately, you must go to the equatorial plane, and it is best to have an electric tracking system.

Accessories, such as eyepiece and equatorial telescope. , will come with them, and Barrow's mirror will extend the focal length. If photography needs electronic eyepiece, the professional is frozen CCD, but the price will be tens of thousands. Of course, if you have a SLR camera, you can also shoot with long exposure. There are also Budd's membrane mirrors or Herschel prisms (the latter are much more expensive) that need to be dimmed to see the sun.

All the above are my original suggestions to you at the expense of working hours. I hope it's useful to you, adopt it if you think it's useful, and keep asking questions if you have any questions.