How to Calculate the Field of View of the Sky-Watcher Short Tube Refractor Telescope

The area in which you can see through your telescope is known as the true field of view. Your telescope’s field of view is determined by the design of the eyepiece. Here is how to find the field of view of the Sky-Watcher Short Tube Refractor Telescope.

Instructions

Difficulty: Moderate

1. Find out the value of the apparent field of view. Every eyepiece has its own value of the apparent field of view. This value is supplied by the manufacturer.
2. Find the value of magnification. To do this, divide the value of the focal length of your telescope by the focal length of the eyepiece. Assuming that your telescope has a focal length of 750 mm and the focal length of the eyepiece is 10 mm, the magnification for your telescope will be 750/10 = 75. It is usually denoted as 75x. The focal length for this model is 400 mm.
3. Divide the value of the apparent field of view by the value of magnification to get the field of view value. For example, the eyepiece has a value of apparent field of view as 50 degrees and magnification of 75x, then the value of actual field of view is equal to 50 degrees/75x = 0.66 degrees.

Tips & Warnings

• Take care that the magnification is not too high and the field of view does not have a very small value. In such a situation, finding the objects you want to watch through your telescope may be difficult.
• The magnification of your telescope should be 2x per each mm of aperture for good viewing.

Who Can Help:

• Find Electrical Services Here. Compare Up to 4 Quotes, Free Service & No Obligation.