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How Much Back Focus Is Needed For Telescope? (Question)

As previously stated, the rear focus length of 55mm is considered industry standard. Using a T-ring, which is commonly used to attach cameras to telescopes and other optical devices, you may accomplish your goal.
55mm is the normal length for back focus in the industry, as stated above. A T-ring, which is used to attach cameras to telescopes and other optical equipment, can be utilized to accomplish this goal.

  • Because of this, the price varies substantially depending on the type of telescope: Typically, Schmidt-Cassegrain telescopes (SCTs) have back focus distances of roughly 5 inches, which is rather liberal. Maksutov-Cassegrains (Maks) are another type of lens that has long back focus distances. It is common for Newtonian reflectors to have substantially lower back focus distances, sometimes as little as 1-2 inches.

How do you calculate back focus on a telescope?

To figure out how much backfocus your setup has, combine the backfocus of all of the individual components together. Consider the Atik 460EX camera, which has a backfocus range of 13mm. It is a good illustration of this. When we throw in an EFW2 filter wheel, we get a backfocus of 22mm, which is rather good.

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How close can a telescope focus?

It is not a difficulty to utilize the telescope during the daylight. Because of the picture curvature, you’ll still need a strong field flattener, just like you would with AP, but you should be able to concentrate on something that’s around 100-200 feet away, give or take.

What is a good magnification for a home telescope?

As the aperture of the telescope grows in size, the amount of light that can be captured and clearly observed grows as well, allowing dim and hazy things to become more discernible and visible. The majority of users feel that a useful magnification ranges between 20x and 50x per inch of aperture.

What telescope focal length is best for astrophotography?

Wide-field astrophotography setups are often kept at or below 70 mm in focal length for the sake of comparison. If you keep shooting for too long, you’ll start to notice that some items are impossible to capture in a single picture. As a result, the focal length has an impact on another important component in all of this, namely the focal ratio.

Why does my 55mm back focus?

It is always true that adding a filter to the optical path increases the rear focus distance. If your filter is 3mm thick, you will need to add 1mm of gap between your imaging train and the filter in order to maintain the right back focus. Therefore, a 55mm back focus lens would become 56mm once a 3mm thick filter was fitted to the image train, making it a 55mm lens.

How important is back focus?

The ability to use accessories with your telescope is directly impacted by the back focus of your telescope. It is possible that you will be unable to use Barlows, focal reducers, binoviewers, SLRs, and 2 in eyepieces because of the limited rear focus.

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Do you need to focus a telescope?

It’s important to remember to focus: Every telescope has a focuser, and whenever you approach the eyepiece of a telescope, whether it’s your own or someone else’s, you should focus the image so that it’s as sharp as possible. Please keep in mind that everyone’s eyes are different, and that being “nearly” in focus is not acceptable.

Why is my telescope blurry?

The most common reason for most telescope pictures to be too hazy to be identified precisely is due to the use of excessive magnification. In some atmospheric circumstances, magnifications greater than 200X may cause pictures to become indistinct. The magnification on a hot summer night will be different than the magnification on a cold winter night.

What can you see with a 100mm telescope?

To What Can You Look Forward When Using 100mm Telescopes? (With Illustrations)

  • 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.

Why can’t I see planets through my telescope?

Planets are tiny and far away enough from the Earth that they will never cover a substantial percentage of your field of vision, even at the greatest practical magnification available on your telescope. Consider that the smallest focal length in the box with many Celestron basic telescopes is a 10mm eyepiece, the shortest focal length available on the market.

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What can you 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).

Can you use a Dobsonian telescope for astrophotography?

When it comes to astrophotography, Dobsonian telescopes are a good choice. They are not, however, suited for capturing weak and dark things in the night sky because of their low contrast. If you wish to snap pictures of the brilliant planets or the Moon, a Dobsonian telescope is the best tool for the job.

What type of telescope is best for viewing planets?

Solar system objects such as the planets, our Moon, and Jupiter’s moons may all be seen well using telescopes with diameters of 4 or 5 inches or more. With a scope this narrow, it can be difficult to see Neptune and Uranus, but it is not impossible to do so.

What is a good aperture for a telescope?

For observing solar system objects like the planets, our Moon, and Jupiter’s moons, 4 or 5 inch diameter telescopes are excellent choices. With a scope this narrow, it can be difficult to see Neptune and Uranus, but it is not impossible to see them.

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