Astronomical telescopes are divided into 3 categories: refractive, Newtonian reflective, and refractive.
Refractive type: combined with several lenses, the front tube enters the light, and the refraction of the lens is magnified. However, it is all glass and weighs heavily.
Easy to operate, easy to use, suitable for beginners, that is, the price is slightly expensive, but the imaging is better.
Newtonian reflex: invented by Newton, commonly known as cow reflex.
It uses the reflection of the mirror to magnify the image, and the bottom of the lens barrel is a concave mirror that reflects light, because it has only one objective lens, so it is easier to achieve a large aperture.
Refractive type: Refractive reflection is the best combination of refraction and reflection.
He added glass lenses to Newtonian mirrors, and this finer imaging effect was mostly used in professional astrophotography.
