What does 10X21 field 6 5 mean on the telescope. I know what 10x zoom and everything else means

The magnification is 10 and the objective aperture is inches. The field of view is.

The representation method of a telescope with fixed magnification: magnification x objective lens aperture (diameter, mm), for example, 7x35 means that the magnification of this kind of telescope is 7 times, and the objective lens aperture is 35 mm; 10 x 50 means that the telescope has a magnification of 10x and an objective lens aperture of 50 mm.

The magnification of a telescope refers to the magnification of a telescope refers to the ability of the telescope to pull an object closer, such as using a 7x telescope to observe an object, the effect of an object observed 700 meters away is similar to the effect of an object observed by the naked eye at a distance of 100 meters.

Exit pupil diameterThe exit pupil diameter is an important parameter that is often overlooked. In fact, the exit pupil diameter is the maximum aperture of the camera lens, which determines the brightness of the telephoto field.

60*90

The number in front refers to the caliber of the lens at one end of the binocular, and the back is its magnification (this refers to the logo on the regular telescope, if the merchant intends to falsify, it is a different matter).

1. What is the magnification of a telescope?

It is the magnification of the angle of viewing an object with the naked eye and the angle magnification of observing the same object at the same place with a telescope. For example, if the angle of a bird to the naked eye is 6 arc minutes, and the angle of observation with a telescope is 60 arc minutes, the telescope will have a magnification of 10 times.

2. How is the magnification calculated?

Magnification. Objective focal length.

Eyepiece focal length. If the telescope doesn't indicate the focal length of the objective, you can actually measure it. For example, measure the diameter of the image of the sun, and according to the sun.

The imaging diameter per meter focal length is calculated. In addition, the focal length of the objective lens can generally be estimated from the length of the lens barrel. For one.

For telescopes with special structures, the optical path may pass through the internal prism or plane mirror refraction, which will shorten the length of the actual lens barrel and the ridge shape.

Refraction is not even easily observed from the outside. In addition, due to the special structure of telephoto lenses, the length of the lens barrel can be much smaller than the focal length, even though there is no reflection.

3. Is it better to have a larger magnification?

No. The magnification of the telescope should be moderate, and the main limitations are as follows:

1. The magnification is too large and should not be stable.

12 times is the hand-held limit, and it is best to have your elbow supported when observing, and the body or telescope is attached to some fixed object.

2. If the magnification is large, the actual field of view will be reduced accordingly.

In general, the larger the multiplier, the smaller the area that can be observed at the same time.

3. In the case of the same objective lens aperture, the larger the magnification, the lower the inverse square ratio of brightness.

4. The acquisition of large multiples is generally carried out through the eyepiece with a short focal length.

5. The unsatisfactory observation conditions such as the atmosphere itself also limit the maximum magnification.

6. The multiple selection is too large, exceeding the theoretical resolution limit, which will cause invalid amplification.

The magnification of an astronomical telescope refers to the physical quantity of the visual telescope, i.e., the magnification of the angle. It is equal to the ratio of the focal length of the objective lens to the focal length of the eyepiece.

When many people mention astronomical telescopes, the first thing they consider is magnification. In fact, astronomical telescopes are different from microscopes, and the effect of ground astronomical observation is not only the quality of the instrument, but also affected by the clarity and tranquility of the earth's atmosphere, and the environment of the observation site. Moreover, an astronomical telescope has several eyepieces with different focal lengths, that is, several different magnifications are available.

When observing, the maximum magnification should never be the best, but the clearest observation target should prevail.

This is a very widespread misconception that astronomical telescopes are about magnification. Not really.

The magnification of the telescope Objective focal length Eyepiece focal length.

Any telescope can achieve a large magnification with a very small telescope, but the imaging is a mess.

So (a very important point!! The magnification of a telescope is not a parameter of a telescope!! These merchants use this to gain !!

Telescopes have a range of magnifications – a reasonable magnification of 60 for the resolution of a telescope in arc seconds

The resolution of the telescope is 114 the aperture (mm) of the telescope

So, the most important parameter that determines a telescope is the aperture!! It determines the telescope's light-gathering capacity and resolution.

The landlord may have such an idea because binoculars are multiples. Because the eyepieces of binoculars are fixed and not removable, there is such a fixed multiple. However, this should not lead to generalizations.

The above is a question I answered in the astronomical version after some modifications, and some may not match the landlord's question. I hope that in the future, the landlord will have something to discuss with you in the astronomical version.

8 35 represents eight times, 35 refers to the caliber, just buy 10 20 If you travel, you have to buy a small one to watch a concert, and ten times it is just right. When buying, don't buy 50 or 50, the maximum multiplier of the telescope is 10 times. There are also a few fifteen times the zoom, and dozens of times are knockoffs.

99990*280, of which 99990 is a multiple, 280 is the aperture unit, mm (but I think the value of the subscript on your telescope is not accurate) 1000m 10000m is the field of view, that is, when you are looking at the scenery at a distance of 1000m, your field of view from left to right is 10000m

That's probably it (I can tell you that the values on your telescope are out of order, and the standard value should be something like 7*30.)

and so on).

It's best to choose 7 times for hand-holding, and I'm still very dizzy with a 10 times. Suggestion 7 50, parameter meaning upstairs correct solution.

[1] For example, it is marked 10 50 mm 5°, which means that the diameter of the objective lens is 50 mm and the field of view is 5 degrees (i.e. at 1000).

Some people may think that the higher the number of technical parameters, the better, but this is not the case. The magnification is inversely proportional to the width of the field of view, i.e., the greater the magnification, the smaller the width of the field of view, which is not conducive to searching. The larger the diameter of the objective lens, the more light intake, and the stronger the resolution ability when the light is insufficient, but this will inevitably lead to an increase in the volume of the telescope, which is not conducive to carrying.

The first one, the previous label is not very clear, but the last 10*25mm refers to 10 times, and the lens diameter is 25mm.

The same goes for the second. You can watch both concerts, mainly to see which one is lighter. Otherwise, it's tiring to hold it in your hands all the time. In addition, the angle of view with a large lens diameter is relatively large, but it is not too important to watch a concert.

The clarity depends on the quality of the optical glass of the optical instrument (including telescopes and cameras) and the ratio and structure between the concave and convex mirrors, which is often said to be the resolution of the lens. Not necessarily the higher the multiple, the clearer.

Tencent Weiwen] to find the answer for you: ""10 42" is generally seen in binoculars, which means: magnification 10 times, objective lens port...If you have a question @ micro question Weibo can also ask questions ] to see the answer and comment:

The number 8x21 on the binoculars indicates that the magnification of the telescope is 8 times, and the aperture of the objective lens is 21mm, and 10x21 indicates that the magnification of the telescope is 10 times, and the aperture of the objective lens is 21mm.

(Desert Gold Motion Optics).

Reputation Verification |8/8/2011 10:29 Problems with focusing and aiming.

The astronomical telescope has the characteristics of high magnification, and the multiple and the field of view (observable range) are inversely proportional, because there is a relationship between high power and small field of view, so it is difficult for novices to master the skills of finding targets

1. Are all the protective covers open?

2. Have you installed the eyepiece with the lowest magnification (longest focal length)?

3. Have you found your goal? (This is the most important link).

4. Have you carefully adjusted the focus?

5. Don't look through the glass window?

6. Is the optical axis of the finderscope parallel to the primary mirror?

Don't laugh, maybe it's these factors that cause you to not see the target, be sure to observe it with a low-powered eyepiece.

It is recommended that you first practice finding objects in the scope and focusing on objects in the distance during the day, if you can't see ordinary objects (such as distant leaves) during the day, it means that your level still needs to be practiced.

If you can see the target clearly, write down the current position of the focusing seat, mark the scale with the Qingzhi digging scale, use a marker stroke if there is no scale, and use different eyepieces to make the corresponding focus mark. At night, you can see it clearly by directly adjusting it to the mark corresponding to the eyepiece.

After seeing an object clearly, move it to the center of the field of view, stabilize the telescope, and then gently adjust the three screws of the finderscope constellation, so that the target appears at the crosshair, so that the two optical axes are parallel, and to find a new object in the future, first aim with the finderscope, and then use the primary mirror**.

Explain that the magnification of this telescope is 30x; The objective lens diameter is 60 mm.

The standard format of telescope specifications is [telescope magnification objective lens aperture (mm)].

In addition, there are other parameters, such as: specification: 10x40; Field of View:

6°30' ；1000m horizon: 114 1000m; Exit pupil distance: 12 mm; Exit pupil diameter:

4 mm ; Resolution:", which indicates:

Specification] 10x40 means that the magnification or magnification of the telescope is 10x, and the diameter of the objective lens of the telescope is 40 mm. For zoom telescopes, it might be labeled: 10-40x60, then the magnification is continuously adjustable between 10-40x, and the aperture is 60 mm.

Pay attention to identification: it makes no sense that the multiples are much larger than the aperture, and some inferior telescopes mark: 999x50, etc., is a deception.

In addition, some telescopes are labeled as "10x40x", which is also irregular and misleading.

Field of view] 6°30'Indicates the field of view of the telescope**, the larger the magnification of the telescope, the smaller the field of view. 【1000m horizon】114 1000m Another way to express the size of the field of view, counting on the width of the range seen by the telescope at a distance of 1000 meters, the larger the telescope magnification, the smaller this parameter.

Exit pupil distance] The optimal distance between the eye and the eyepiece when imaging on the retina with a 12 mm telescope. It is related to the magnification of the telescope, etc., and generally speaking, the exit pupil distance of the telescope with a high magnification is smaller. A sufficiently large exit pupil diameter allows the telescope to be used when the user is wearing a gas mask or glasses.

Exit pupil diameter] 4 mm Exit pupil diameter = caliber multiple. For example, with this 10x40 telescope, the diameter of the exit pupil is 4 mm. Of course, this is ideal, and some telescopes may not be able to achieve this theoretical value due to optical path design and cost.

Resolution:"Count on the telescope's ability to resolve the smallest details.

You use the aperture of the objective lens and the aperture of the eyepiece to see if it's a multiple of about 18, and if so, it's a method multiple.

The magnification of the objective lens of the eyepiece, the product of which is the magnification of the telescope!

The magnification is 30 and the objective lens aperture is 60 mm.