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Anonymous users2024-02-07Telescope.
Multiples = focal length eyepiece, e.g. if the focal length is 800mm, use a 4mm eyepiece, multiple=800 4=200x... The magnification of the astronomical telescope is not as large as possible, and the clarity will decrease if the field of view is smaller, so it is generally good to choose the appropriate magnification depending on the observation conditions.
Here's an example. The magnification limit of the astronomical telescope (such as the Powerseeker 80EQ, focal length 900mm) is about 2 times the aperture of the astronomical telescope (which requires a good environment) in millimeters, and the magnification is only a little more than 1 times the aperture of the aperture in millimeters, while the magnification of 4mm is 225 times for 80EQ; The magnification limit of the telescope itself is 160 times, and it is only about 100 times in normal conditions. Therefore, under the premise of good observation quality, the eyepiece with the largest magnification should be 6mm.
To put it simply, you need to know the objective focal length, and divide the objective focal length by the eyepiece focal length 4 to get the magnification.
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Anonymous users2024-02-06How far can a telescope with a size 2000 24 see a clear object?
How far can a telescope with a size 2000 24 see a clear object? You can see the numbers and letters on the license plate within 200 meters of the socks. It's just that the hand has to be held very steadily, and you can't see it clearly if you tremble.
Of course, it also has something to do with your eyesight. Good eyesight and can see things within two kilometers.
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Anonymous users2024-02-05The difference between 50mm and 70mm aperture astronomical telescopes is that the aperture is different and the imaging is different.
People with normal vision can see 6th magnitude stars in the darkest and transparent air, while the light gathering power of 70mm aperture telescopes is 100 times that of the naked eye, and 11th magnitude stars can be seen five magnitude fainter than 6th magnitude stars.
Focal ratio: The ratio of the focal length of the objective lens to the aperture, which is equivalent to the aperture on the camera lens. If the aperture remains the same, the longer the focal length of the objective lens, the larger the focal ratio, and the higher the magnification is easy to obtain. The shorter the focal length of the objective lens, the smaller the focal ratio, and it is not easy to get a higher magnification, but the image is brighter and the field of view is larger.
1. Short focal length mirror (small focal ratio, focal ratio <=6): suitable for observing nebulae and looking for comets.
2. Telefocal lens (large focal ratio, focal ratio 15): suitable for observing the moon and planets.
3. Medium focal length lens (medium focal ratio, 6<; Focal ratio <=15): suitable for observing binary stars, clusters, variable stars, and star clusters.
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Anonymous users2024-02-04IMHO, the multiplier of the telescope is the least valuable of all parameters, unless it is a practically usable multiple.
The "objective lens aperture 80+mm, objective focal length 900+mm" you mentioned is the most common specification in popular refracting telescopes, referred to as 80 900 (see the figure below for appearance). This type of mirror has a longer focal length of the objective lens and is more flexible with the eyepiece. Since the magnification of the telescope system = objective focal length eyepiece eyepiece focal length, it can be equipped with a 40mm eyepiece to obtain a magnification of magnification, 36 times with a 25mm eyepiece, 90 times with a 10mm eyepiece, and a 4mm eyepiece with the shortest focal length on the market, with a magnification of up to 225 times (which has already exceeded the limit of the objective lens).
At this point, you may have questions - why did the merchant mark the magnification of this mirror to a terrifying 675 times? It's actually quite simple, because this mirror usually comes standard with a very junk 2x Barrow.
Mirror case: a more littery double image mirror. 225*2*, the final score is exactly 675.
By now you should understand. You can insert as many extenders and any short-throw eyepiece into the beam telescope path as you want, and you can get any large multiple. But is this kind of multiple useful, or is it possible to observe the target under this multiple, or the brother scum file is not clear, or lower the standard to say that you can still see one of the targets?
Hardly. In general, experienced telescope users will limit the overall magnification of the mirror to less than 2 times the number of millimeters of the objective aperture, which is a well-established standard.
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Anonymous users2024-02-03The resolution is the arc secondThere are two types of limit resolution for telescopes, the Rayleigh limit and the Dow limit. Commonly used is the Rayleigh limit = , where is the observed wavelength and d is the clear diameter of the telescope objective.
where the resolution is the angle, the unit is radians, the unit of wavelength is nanometers, and the unit of d is centimeters.
in visible light. In the wavelength band, the wavelength is generally 550 nanometers, and the simple method of calculating the silver mill is 14 d (arc seconds), such as the 10 cm aperture telescope, the resolution is the arc second. The limiting resolution means that the telescope can decompose two points that are close to each other without seeing them as a single point, so the smaller the number, the stronger the resolution of the telescope.
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Anonymous users2024-02-02Summary. Hello, happy to serve you. I am a co-teacher who has been in the industry for 12 years now, thank you very much for your patience.
Keeping you waiting. The focal length of the objective lens of a telescope is 1000 mm, the aperture is 120 mm, the focal length of the eyepiece is 20 mm, and its angular magnification is: 1000 20 = 50 times.
Astronomical telescope magnification = objective focal length eyepiece focal length So the magnification of the objective lens with a focal length of 1000mm with a focal length of 20mm and a focal length of 20mm and a focal length eyepiece of 20mm is 50
Hello, dear, this question is up to me, it takes a little time to type, please be patient.
Hello, happy to serve you. I almost asked the co-teacher, who has been in the industry for 12 years now, thank you very much for your patience. Keeping you waiting.
The focal length of the objective lens of a telescope is 1000 mm, the aperture is 120 mm, the focal length of the eyepiece is 20 mm, and its angular magnification is: 1000 20 = 50 times. Astronomical telescope Yinqinghuai magnification = objective focal length eyepiece focal length So the magnification of the objective lens with a focal length of 1000mm with a focal length of 20mm and a focal length of 20mm and a focal length eyepiece is 50
I hope the above checkpoints will be helpful to you If you don't understand anything, you can continue to consult the teacher, if you are satisfied with me, please give a thumbs up
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Anonymous users2024-02-01Again, there is no such indicator as "how far away you can see with a telescope". You can see the M31 galaxy 2.2 million light-years away with the naked eye, but you can't see an ant 1 kilometer away. Define how far your eyes can see?
As for the "how far you can see" the telescope you are concerned about, multiply the aforementioned "how far" your eyes can see by the magnification of the telescope.
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Anonymous users2024-01-31Summary. Hello dear, the telescope used by amateur astronomers is generally between 80mm and 200mm, and some enthusiasts may use a telescope with an aperture of about 400mm
Hello dear, the telescope used by amateur astronomers is generally between 80mm and 200mm, and some enthusiasts may use a telescope with a diameter of 400mm
Starting from the aperture of 500mm (meters), it has entered the field of professional astronomical telescopes, and generally only popular science venues, scientific research institutions, and universities will build telescopes with an aperture greater than meters.
The large-scale telescopes of China's scientific research units have reached about 4 meters, while the world's largest aperture astronomical telescopes currently in use are 10 meters. The next generation of ultra-large astronomical telescopes can reach 30 meters to 40 meters, but this one is currently under construction
D130F650 with multiple length of water pipes.
More suitable? Hello dear, D130F650 is suitable for water pipes with diameters above DN40.
It is more appropriate to choose DN50-DN65 caliber.
Hello Beginners mostly choose refraction and maca reflection is not recommended to use Sky Wolf Sailing, Xingtron 80eq, Boguan 80, Boguan Marca, Xinda 80, Xinda Marca are all great Beginners are very practical! I've been playing with equipment for a long time, and it's been one step at a time, and my first astronomical telescope was the Changge of the Celestial Wolf.
First of all, you have to know what you want to see, the planet Deep Space Hoshino? >>>More
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Beijing Galaxy Telescope Answer:
The gap between astronomical telescopes is very large, and our ordinary junior astronomy enthusiasts can choose non-professional mirrors (professional mirrors are very expensive, and they are generally used for professional observation). **In the 1000-2000 yuan or so low-end astronomical telescope can be, of course, if you are very passionate about astronomy, for the observation effect of high requirements, you must choose the high-end telescope, refraction and reflection have their own advantages and disadvantages, mainly depending on what you want to observe, choose the best one for yourself; >>>More
Amateur astronomers generally control the multiples of mirrors within 200 times, and less than 100 times to see the moon. The landlord said that 500 times is too general, can you be specific. Almost 70 times you can see Jupiter's extreme moons, Saturn's rings.