With this eyepiece calculator tool you can easily evaluate how a certain telescope-eyepiece combination will work and how large the field of view (FOV) will be compared to known objects.

How to use the Eyepiece calculator

  1. Input your telescopes aperture and focal length and any extra reducer/barlow if used.
  2. Select an eyepiece from the list or input the eyepiece data (focal length and appearant field of view ) via the sliders.

Based on this you will se a graphic illustration of the field of view.

In the summary list you will get all the data needed to review the telescope-eyepiece combination.

If you want a certain eyepiece added to the list please contact us.