Why is the objective lens of an astronomical telescope made very large, while the objective lens of

The larger the objective of an astronomical telescope, the stronger the spotlight, and the brighter the stars you can see, in fact, the larger the objective of the telescope, the smaller the field of view, and it will be a little better with a wide-angle eyepiece.

The smaller the objective of a microscope, the bigger you see.

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The large objective lens means a wide field of view. The sky is vast, and a wide-field telescope can be used to better search for stars. Microscopes are used to look at microscopic objects, so they are not used for a large scale.

The size of the objective lens is a very important factor in determining the value of a telescope, and its importance is no less than the multiple.

Telescope to see"I don't know"The main thing is to see if the objective lens is big enough, to put it simply, our eyes are not as big as telescopes, so we can't see fainter stars than telescopes.

As for microscopes, I think so, because most of the observations are small organisms such as cells and bacteria, so the objective lens of the microscope is relative to these organisms"Big enough"Finish.

So there's no need to be as big as a telescope objective.

I don't know if this explanation is reasonable, I hope professionals will answer it.

One is to magnify the illusion.

One is to broaden the perspective.

Because the larger the diameter of the objective, the larger the clear aperture, the more light will come in, and the fainter the star will be. Being able to see very faint stars is, of course, the goal pursued by astronomical telescopes. However, the diameter of the lens is directly proportional to the focal length.

For microscopes, light intensity is not an issue, and there is no need to use a large objective.

What is the difference in astronomical telescope eyepiece size. The more detailed, the better.

Hello dear, the 10mm eyepiece is the most commonly used, except for some particularly large and faint deep-sky objects (such as M31); The 2,20mm eyepiece can obtain a relatively low system magnification, which is used to see open star clusters, globular clusters and nebulae, galaxies, etc., and can also be used to find stars, that is, to find the target celestial body and then change to a short-throw eyepiece for high-magnification observation. The magnification that can be obtained by the 3,4mm eyepiece is very high, and it is mainly used to distinguish binary stars, observe the details of the surface of planets and moons, and check the accuracy of the objective lens. Astronomical telescopes, modulus stool mirrors, eyepieces, don't seem to have a short focus like millimeters.

Please verify that the xxmm you mentioned earlier is the eyepiece focal length unit millimeter, if it is useful, please give a thumbs up! Here, I also wish you good health, all the best, and all your wishes come true! Pay attention to safety measures during the epidemic

The 1,10 mm eyepiece is the most commonly used and can be observed with it except for some particularly large and faint deep-sky objects (such as M31);

The 2,20mm eyepiece can obtain a relatively low system magnification, which is used to see open star clusters, globular clusters and nebulae, galaxies, etc., and can also be used to find stars, that is, to find the target celestial body and then change to a short-throw eyepiece for high-magnification observation.

The magnification of the 3,4mm eyepiece is very high, and it is mainly used to distinguish binary stars, observe the details of the surface of planets and moons, and check the accuracy of the objective lens.

Astronomical telescope eyepieces don't seem to have a short focus like millimeters. Please verify.

The xxmm you mentioned earlier is the eyepiece focal length.

Unit: mm. As for the design of the internal optical size of the cow anti, please see the tutorial below.

Other friends.

The larger the eyepiece aperture, the larger the field of view (but also limited to the objective aperture), the smaller the magnification, and the smaller the eyepiece aperture, and vice versa.

An astronomical telescope consisting of two convex lenses has the distance from the objective lens to the eyepiece is the sum of the focal lengths of the two convex lenses.

Because the optical path principle of the Kepler hail portable telescope is that the objective lens (convex lens) turns the distant scene into an inverted reduced real image, if the distance of the scene is much greater than twice the focal length of the objective lens, then the inverted reduced real image is imaged on the focal length of the objective lens, and the function of the eyepiece (convex lens) is to magnify the real image of this inverted shrinkage, because the magnification effect of the convex lens is used, so it is basically one time of the focal length of the eyepiece, so the overall optical path is the focal length of the objective lens and the eyepiece.

The distance between the objective lens and the eyepiece.

1. In terms of brightness, astronomical observations.

The vast majority of targets are very small in brightness and increase.

The objective lens size can be increased.

The amount of light transmitted, so that the imaging brightness of the observed target is sufficient to be observed. The microscope is equipped with an auxiliary illumination source.

Don't worry about brightness if it's smaller.

2. From the principle of optics.

Above, astronomical targets are at huge distances, with images between one and two times the focal length and close to the focal point. Therefore, in order to increase the imaging size of the objective lens, it is necessary to increase the size of the objective lens to ensure that the curved surface can be processed with sufficient accuracy. The objective lens of the microscope is imaged outside twice the focal length and needs to be made small to increase the surface curvature of the objective, that is, to make a short focal length.

If a large objective lens is used, the short focal length means that the thickness of the objective lens varies too much and is not easy to manufacture.

The object of the astronomical telescope is distant stars, which are generally very faint, so a large objective lens is needed to collect the converging light.

The function of the eyepiece is to cooperate with the objective lens to magnify the target, where the magnification is the focal length of the objective lens divided by the focal length of the eyepiece. Therefore, the focal length of the eyepiece is shorter, and the magnification is larger. As for the eyepiece, it is smaller because it does not need to be that large, because the parallel rays of starlight are very narrow after the convergence of the objective lens, and the focal length of the eyepiece is also short, so there is no need for a large-aperture eyepiece.