# What is the focal length of an 8 inch telescope?

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## What can you see with an 8-inch telescope?

The most distant galaxies that you will be able to see with an 8″ telescope will be about 50 to 100 million light years away e.g. M109 with apparent magnitude 10.3 at distance 83 ± 24 million light years. You’d just about be able to resolve M49. So the answer would seem to be “at least 72 million light years”.

## How do you calculate the focal length of a telescope?

Magnification (power): The amount that a telescope enlarges its subject. It’s equal to the telescope’s focal length divided by the eyepiece’s focal length.

Telescope Calculator Results:

Telescope aperture = mm
Barlow lens = None 1.5 x 2.0 x 2.5 x 2.8 x 3.0 x 3.5 x 4.0 x 4.5 x 5.0 x

## What is the magnification of an 8-inch telescope?

Yes, an 8” telescope can handle up to 400x magnification on a good night and will show you details of many craters. On many nights, crater details in a scope of this size will be limited by blurring due to the earth’s atmosphere. You don’t even need that much aperture to view the craters on moon.

## What is the focal length of a telescope?

Focal length is the large number you’ll often see printed or engraved on the front or back of the scope, usually between about 400 and 3,000 millimeters. The focal length is often found on the front or back of the telescope.

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## Is an 8-inch telescope good?

An 8-inch telescope (it doesn’t matter what type) will move you into a new dimension of viewing. The objects you see with an 8-inch scope will reveal more detail. Keep in mind, however, that if you stay interested in observing, you’ll crave even larger scopes.

## What can you see with a 90mm telescope?

A 90mm telescope will provide you with a clear view of the Saturn along with its rings, Uranus, Neptune, and Jupiter with its Great Red Spot. You can also expect to see stars with 12 stellar magnitude with a 90mm telescope.