My daughter wants to buy a telescope how to buy a telescope

1. You should know the age and physique of Ling Ai. Children often like to hang binoculars around their necks like the "PLA uncle" in the movie. However, the mirror is too heavy and not good for the child's bone development.

2. Unfortunately, mirrors that are light in weight and have good optics are rare, and they are very expensive.

3. You should know the level of eyesight of Ling Ai. If you have symptoms of dizziness and eye fatigue, don't choose a telescope with a large depth of field.

4. When buying a telescope, don't be superstitious about magnification. If the magnification is too high, the imaging quality will be reduced accordingly, the jitter will be very large, and it will be easy to get tired during observation, which is not good for the child's vision. Many fake and shoddy telescopes also falsely mark magnification, marking to an outrageous n 9.

5. According to military and outdoor experience, the magnification of hand-held binoculars should be 7 times, 8 times, and 10 times. Less than 7x is not enough, and more than 10x jitter is greater.

6. According to the experience of military and outdoor, the diameter of the objective lens of hand-held binoculars should be 30mm to 50mm. If the diameter of the objective lens is less than 30mm, the incident light is relatively weak, which affects the image quality; The objective lens diameter is higher than 50mm, and the mirror is too heavy.

7. Be sure to pay attention to the optical axis! Be sure to pay attention to the optical axis!! Be sure to pay attention to the optical axis!!

Inferior telescopes often cut corners, the prism is not firmly fixed, and the optical axis is easy to deviate. Once the optical axis deviates, the optical paths of the two lens barrels are not parallel, and when looking at things, they "squint". You don't want your child to have a headache after looking at the telescope for a while, do you?

8. Don't believe in the so-called "military", "night vision", "infrared", "autofocus" and other gimmicks.

1) The output of military telescopes is high, and the cost needs to be controlled, so military telescopes adopt mature and stable mechanical design, and the quality management is also strict, but the optical quality may not be very good. What's even worse is that domestic merchants often deliberately hype up military products and sell military telescopes very expensive.

2) It is true that high-quality telescopes can maintain good image quality at night observation, but "infrared" or "night vision" telescopes basically do not exist. If you can see the features clearly at night, you should go with night vision devices! A good night vision device is big, and it's more expensive than a computer.

3) The so-called "autofocus" is actually the depth of field of the mirror is very large, the user takes a telescope that meets the technical standards, according to their own vision, after the interpupillary distance is set, there is no need to adjust it, and you can focus on it from far and near.

This mainly depends on whether you want binoculars or astronomical telescopes, generally binoculars are about 8 times fine, if it is astronomical, it is best not to exceed the times of the aperture. Don't blindly pursue multiples when buying a telescope, the main thing is to look at the aperture of the telescope, generally the larger the aperture, the more details you can see. Buy telescopes all in Wuhan Rongcheng Technology, you can search on the Internet.

If it is a handheld telescope, the magnification should not exceed 10 times, generally 5 to 8 times is fine. If the magnification is too large, the screen will shake very much.

On the top floor, but does the landlord want to buy a single or double tube?