General Binoculars Refractors Reflectors Catadioptrics Mounts Eyepieces

Eyepieces (Under Construction)

Eyepiece Magnification Calculator

If you know the diameter of your telescopes primary mirror or objective lens and its focal ratio, we can calculate its local length using the 'Calculate focal length' button. If you already know your telescopes focal lenght then you can enter it directly together with the focal length of the eyepiece. Now use the 'Compute Magnification' button to compute this combinations resulting magnification.

Remember to use the same units of measure for each value you enter(*).
Enter the primarys diameter:(*In millimetres, centimetres or inches)
Enter the focal ratio of the primary:
      OR
Enter the focal length of the primary:(*In millimetres, centimetres or inches)
Enter the focal length of the eyepiece:(*In millimetres, centimetres or inches)
General Binoculars Refractors Reflectors Catadioptrics Mounts Eyepieces