Tube Length Of Astronomical Telescope. Now to select the length of the tube given a 1.5 µ focuser with a 7.625 µ O.D. tube, then the distance from the primary face to the secondary fac e is 24 µ² 5.5625 µ = 18.4375 µ and. For beginner’s telescopes look for a focal length of at least 600mm. Anything less than that will limit your viewing experience too much and would only be.

The tube length of an astronomical telescope is an important factor to consider when choosing a telescope. It determines the size and weight of the telescope, as well as its ability to gather light. Telescopes with longer tubes are generally heavier and bulkier, but they can collect more light and therefore make it easier to observe faint objects. Shorter tubes are lighter and more portable, but they may not be able to collect enough light for effective viewing.

The tube length of an astronomical telescope is usually measured in millimeters (mm). To determine the correct tube length for your telescope, you must consider the type of telescope you are using and the focal length of the eyepiece. For refractors, the tube length should be at least 2.4 times the focal length of the eyepiece. For reflectors, the tube length should be at least 3.6 times the focal length of the eyepiece.

## Step-by-Step Guide to Choosing the Right Tube Length

- Determine the type of telescope you are using: refractor or reflector.
- Measure the focal length of the eyepiece.
- Multiply the focal length of the eyepiece by 2.4 (for refractors) or 3.6 (for reflectors) to determine the minimum tube length.
- Choose a telescope with a tube length of at least the minimum recommended length.

For example, if you are using a refractor telescope with a focal length of 500mm, then the minimum tube length should be at least 1200mm (500 x 2.4 = 1200).

It is important to note that the tube length of an astronomical telescope can be adjusted to suit your viewing needs. Longer tubes will allow for more light gathering, but shorter tubes will be lighter and more portable. It is recommended to choose a telescope with a tube length that is slightly longer than the minimum recommended length, to ensure the best viewing experience.

## Optics Optical instruments Astronomical telescope Calculations

This video contains three examples about calculations involved in astronomical telescopes, and two exercises. The last one requires you to make some research about eye ring in telescopes. Feel free to leave a comment, even when you need me to make a solution for the exercise, or any other videos you want me to make.

The calculation involves application of the lens equation to calculate the image distance of th image formed by the objective lens in the tube of the telescope. Forcing the final image. , Tube Length Of Astronomical Telescope.