Tube Length Of Telescope Formula. The Length of Astronomical Telescope is the distance between the objective lens and the eyepiece and is represented as Ltelescope = fo+ (D*fe)/ (D+fe) or Length of. There is no formula to calculate the focal length of your telescope. It is a fixed measure that is unique to your telescope and can be found on a label usually.

The tube length of telescope formula is an important calculation that astronomers use to determine the best possible length of a telescope tube. It is based on the focal length of the telescope, the diameter of the objective, and the thickness of the tube itself. Here is a step-by-step guide to help you calculate the optimal tube length of a telescope:

- Measure the focal length of the telescope.
- Measure the diameter of the objective lens.
- Calculate the difference between the diameter and the focal length.
- Add the thickness of the tube to the difference.
- Divide the result by two.
- Add the result to the focal length.
- The result is the optimal length of the telescope tube.

The formula for calculating the optimal tube length of a telescope is as follows:

Tube Length = {[Diameter – Focal Length] + Tube Thickness} / 2 + Focal Length

Where Diameter is the diameter of the objective lens and Focal Length is the focal length of the telescope.

When calculating the optimal tube length of a telescope, it is important to consider the weight of the telescope. If the telescope is too heavy, it can lead to a decrease in the quality of the image. For this reason, it is essential to make sure that the telescope is not too heavy for the tube length.

It is also important to consider the size of the tube when calculating the optimal tube length of a telescope. A longer tube will be more difficult to store and transport, while a shorter tube will be easier to store and transport. If the telescope is to be used in a small area, it might be best to choose a shorter tube.

Finally, it is important to consider the type of telescope when calculating the optimal tube length of a telescope. Different types of telescopes require different tube lengths, and it is important to make sure that the tube length is appropriate for the type of telescope being used.

## 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.

Figure 1. The minimum tube diameter is determined b y MTD = 2 * D2E * Tan (TF / 2) + D + 0.5 where the d istance (D2E) is from the primary mirror face to the end of the telescope. magnification = focal length of the telescope / focal length of the eyepiece This means that a larger telescope focal length, increases the magnification. But the. It is calculated by dividing the focal length of the telescope (usually marked on the optical tube) by the focal length of the eyepiece (both in millimeters). Thus: TELESCOPE., Tube Length Of Telescope Formula.