Traditional Culture Encyclopedia - Photography and portraiture - Please recommend an astronomical telescope that can see nebulae. I am a novice, a student party, and I don't have much money.

Please recommend an astronomical telescope that can see nebulae. I am a novice, a student party, and I don't have much money.

First of all, a reminder: don't be fooled by the color photos of nebulae and galaxies on the Internet, thinking that you can see this effect by buying an astronomical telescope casually. In fact, those are photos obtained by long-term exposure with large-aperture telescopes, electric equatorial telescopes and SLR cameras. Looking at the nebula directly through the telescope, you can only see a faint fog without color and details. Speaking of which, have you decided to buy a telescope?

Nebula galaxies belong to deep space objects in astronomical observation, so it is meaningless to visually observe them, and photography is needed to produce results. This kind of celestial body is characterized by large apparent diameter and low brightness, so it can be seen with a very low magnification (such as binoculars 30 times or even 10 times), but seeing does not mean seeing clearly. The observation requirements for deep space celestial bodies are also the highest, which must be in an environment with extremely high atmospheric transparency (based on the fact that the Milky Way can be clearly seen by the naked eye) and little light damage (not too much light pollution, preferably at night without the moon). And deep space photography is also the most expensive. First, it is required that the equatorial plane has high accuracy, the tripod has good quality, and the exposure cannot be out of focus for a long time. Secondly, the aperture of the telescope should not be too small, and the most important thing is that the color difference should be as small as possible. The best shooting results are expensive APO (apochromatic) and ED (ultra-low dispersion), followed by various Marca, Shika and large aperture bull's-eye. As for the entry-level folding reflecting telescope, due to the large chromatic aberration, a set of entry-level equipment (including telescope, equatorial telescope and SLR) that can be used for deep space photography will cost tens of thousands. However, if it is the high-end products such as APO mentioned above, the price of the main mirror alone will exceed 5 digits, which is beyond the average student's affordability.

Suggestion: Novices should avoid over-positioning. First of all, they should start with the most easily observed planets, buy a telephoto telescope with a price of several hundred yuan, such as 80EQ or 70EQ, learn the operation method of the telescope and the essentials of astronomical observation step by step, and then consider further investment when they have a stable income from working in the future.