It is equal to the product of the focal length of the telescope divided by the focal length of the eyepiece. As a matter of thumb, the maximum usable magnification of a telescope is 50 times the aperture in inches of the telescope (or twice its aperture in millimeters).

What factors influence the effectiveness of a telescope?

- The aperture of a telescope is the most accurate measure of its power and capability. The aperture of a telescope is a measurement of how wide the lens of the instrument is. The wider (bigger) the aperture, the more light it collects, and the higher the quality of the photographs you will be able to capture (and photograph, if you wish). In the beginning, the aperture of a beginner’s telescope could be between 2 and 8 inches (60 and 200 mm).

Contents

- 1 What is the formula for magnification of a telescope?
- 2 What is the magnification of a telescope *?
- 3 How is magnification used on a telescope?
- 4 What can I see with a 700mm focal length telescope?
- 5 How do you determine the magnification of an unknown telescope?
- 6 What does 50x magnification mean?
- 7 What magnification do I need to see the rings of Saturn?
- 8 What magnification telescope do I need to see planets?
- 9 How do you calculate Barlow magnification?
- 10 What can you see with a 100mm telescope?
- 11 What can you see with a 200x telescope?
- 12 Is a 70mm telescope good?
- 13 What can I see with a 130mm telescope?
- 14 Which is better 60mm or 70mm telescope?

## What is the formula for magnification of a telescope?

where M is the magnification of the image and fe is the fraction of the image. The focal length of the objective is denoted by the letter fo (sometimes referred to the telescope focal length).

## What is the magnification of a telescope *?

In reality, the magnification provided by a telescope is a connection between two distinct optical systems: the telescope itself and the eyepiece you are using. If you want to know how much power your telescope has, divide the focal length of the telescope (in mm) by the focal length of the eyepiece (in mm).

## How is magnification used on a telescope?

Simple division of the focal length of the eyepiece by the focal length of the telescope yields the formula for viewing distance. As an example, dividing a 1000mm telescope by a 10mm eyepiece will result in a 100x magnification result. 1000 divided by ten equals one hundred. This is due to the fact that 10 multiplies by 1000 100 times.

## What can I see with a 700mm focal length telescope?

It is quite easy to observe every planet in the Solar System using a telescope of 70mm aperture. On the Moon, you will be able to get a close look at the surface and easily discern the majority of its distinguishable features and craters. Mars is going to look fantastic.

## How do you determine the magnification of an unknown telescope?

H/h = 2000/4 = 500, which means that the image h has been magnified by 500 times when the telescope objective has a focal length of 2000 millimeters and the eyepiece is equipped with a focal length of 4 millimeters. The magnification is represented by the amount F/f.

## What does 50x magnification mean?

With a telescope, the magnification power is roughly equivalent to the ratio of the size of an item visible inside its eyepiece compared to the size of the same object when examined with the naked eye. For example, while seeing Mars with a magnification of 50x, the red planet will appear 50 times larger than it would appear if you were simply looking at it with your eyes.

## What magnification do I need to see the rings of Saturn?

If you use even the tiniest telescope at 25x [25 times the magnification], you should be able to see Saturn’s rings. A decent 3-inch scope at 50x [50 times magnification] can reveal them as a distinct structure that is completely isolated from the orb of the planet on all sides.

## What magnification telescope do I need to see planets?

Planetary watchers with years of experience employ 20x to 30x magnification per inch of aperture to view the most planetary detail. Double-star observers can magnify objects up to 50 times per inch (which corresponds to an exit pupil of 12 mm). Beyond that, the vision is hampered by the magnifying power of the telescope and the limits of the human eye.

## How do you calculate Barlow magnification?

A Barlow telescope works by essentially extending the focal length of the telescope and, as a result, the magnification of the telescope when used with a certain eyepiece. For example, if you use the Ultrascopic 30mm eyepiece in conjunction with a 1,200mm focal length telescope, the combined magnification is 40X (1,200/30=40).

## What can you see with a 100mm telescope?

By expanding the focal length of the telescope and, thus, its magnification when used with a certain eyepiece, a Barlow achieves its desired effect. For example, if you use the Ultrascopic 30mm eyepiece in conjunction with a 1,200mm focal length telescope, the combination produces 40X magnification (1,200/30=40).

- When using a 100mm telescope, the greatest magnitude achieved is 13.6. As a point of comparison, the Moon has a magnitude of -12.74 while Mars has a magnitude of -2.6. The Moon is a celestial body. The Moon appears spectacularly in these telescopes, as do Mars, Venus, Jupiter, Saturn, Neptune, Pluto, and the Dwarf Planets.
- Mercury is also visible with these telescopes.

## What can you see with a 200x telescope?

200x – Your full field of view (FOV) encompasses approximately half the surface of the moon. You begin to see minor characteristics that you were previously unaware of, such as little peaks hidden behind craters! At 300x and higher, you begin to have the sensation that you are flying above the surface of the moon.

## Is a 70mm telescope good?

An entry-level 70mm telescope is an excellent starting point for both novices and more experienced astronomers. You can get a good glimpse of practically all of the major objects in the night sky if you look at them from the earth’s surface.

## What can I see with a 130mm telescope?

130mm (5in) to 200mm (8in) or the equivalent in other measurements Double stars separated by roughly 1 arc second in good viewing, as well as some dim stars down to magnitude 13 or better, are among the sights to behold. c) Deep Sky Objects: hundreds of star clusters, nebulae, and galaxies may be seen in the night sky (with hints of spiral structure visible in some galaxies).

## Which is better 60mm or 70mm telescope?

Many amateur astronomers, however, believe that a 70 mm refractor telescope (which collects 36 percent more light than a 60mm telescope) is the very minimum size for a decent quality novice refractor telescope (despite the fact that it costs more). In order to observe brilliant objects such as lunar features, planets, star clusters, and bright double stars, a dark sky is acceptable.