Some problems about stargazing and refracting telescopes

1: When I observed the moon, I found a bright star beside it, which didn't twinkle and was moving slowly. Through the telescope, at least two stars can be seen moving with it (the light is too weak to be seen by the naked eye). I judged it to be a planet. Am I right? If so, is it Mars? Jupiter? Saturn?

Did the landlord observe it yesterday? If so, we can't directly rule out Mars and Saturn. Personally, I think it can't be Jupiter. Although Jupiter closed the moon yesterday, it is 3 degrees north of the moon, so it is impossible to put it on the market. And Jupiter can definitely see the round surface with the telescope of the landlord. Personally, I think it's just a few ordinary stars

2. Can you explain it?

H 12.5h 20 Sr 4mm multiple

Of the two long eyepieces, 1 is "X 1.5", and the other 1 is the magnification of "X3".

How to calculate the current observation magnification, such as "X3 long mirror" and "SR4MM" eyepiece?

Telescope magnification = objective focal length ÷ eyepiece focal length × magnification (if used).

The focal length of the main telescope is 700mm, and the corresponding magnification can be calculated (not complicated).

3. Why do you see many things like bacteria when you use two long eyepieces "x3" and "x 1.5" at the same time? Dust? How to remove it?

It's amazing that the landlord used two magnifying glasses together. This may be an imaging problem caused by high magnification. If it is dust, you can also see low magnification.

The magnification of the landlord SR is strong enough, 175 times. Is it necessary to enlarge it like this again?

4. How to focus the telescope when the magnification is large? As soon as my hand touched the field of view of the telescope, it kept shaking and I couldn't adjust it.

There may be no fixed labor, and this problem is not obvious at low magnification, but at high magnification, the jitter that was not violent becomes very violent.

I don't recommend the landlord to use such a large magnification.

5: What is the most suitable general multiple for observing celestial bodies? (Observe the moon, Venus, Jupiter, Saturn,)

The moon can see the whole circle about 50 times.

When observing Jupiter, Venus and Mars, 100 times is enough. Because the landlord has a good SR eyepiece, it is ok to use 175 quilt, but the landlord must see a strange color planet with such crazy magnification.

6: How to match the eyepiece best?

SR is a medium-grade eyepiece, which performs well under the condition of large magnification.

When searching for celestial bodies, the largest eyepiece (H20) should be used to maximize the field of vision and facilitate the search for celestial bodies. After finding the celestial body, you can change to a larger magnification (SR4) to see the details of the celestial body, but not too large, otherwise the above-mentioned problems will occur.

7: How to distinguish planets from stars? (just see if it will flash? )

No, all five planets can see the circular surface. No matter how magnified the stars are, they can only see a spot of light.

Finally, I want to say a few more words. The landlord's pursuit of magnification makes me feel crazy. Here I want to talk about what magnification is.

I searched Taobao for the explanation of telescope magnification.

For example, a celestial body 100 light-years away uses a magnification of 50 times, just like it is outside the light-year measurement. If you use the magnification of 100 times, it is like being outside the light-year measurement. " If so, the larger the magnification, the better. As long as the magnification becomes infinite, distant celestial bodies are as attractive as before.

Unfortunately, this is not the case.

The magnification of a telescope is actually the field of view. If the original field of view of the telescope is 50 degrees, now I use 50 times magnification, and now its field of view becomes 1 degree, and with 100 times magnification, the field of view becomes 0.5 degrees. The larger the magnification, the larger the field of view, and new stars will not appear in the field of view because of the larger magnification.

Therefore, the amplification of the above-mentioned business promotion is completely deceptive.

Magnification only enlarges the field of vision, not the distance of the observed object. Moreover, if the magnification is too large, the imaging quality will be poor. Ordinary public astronomical telescope, the magnification is below 100 times. Even if the landlord has a better eyepiece, the magnification of 175 times is enough. The magnifying glass itself is never used, and the magnification is too large, which is really boring. If the telescope image gets worse, people can be tortured to death, not to mention the Sunday movement of celestial bodies.