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Advanced Eyepiece Calculator

Create a custom eyepiece magnification table for any combination of telescope and eyepieces
Click here for the Basic Eyepiece Calculator


Step 1)   Enter the multiplication factor of your Barlow lens

x     Note: Set to "0" (zero) if no Barlow used
Step 2)   Enter a brief label that describes your telescope
Step 3)   Enter the focal length of your telescope in millimeters

              If you do not know your telescopes focal length in
              millimeters then enter it in inches

mm
inches  Note: Set to "0" (zero) if mm entered
Step 4)   Enter the aperture of your telescope in millimeters

              If you do not know the aperture of your telescope in
              millimeters then enter it in inches 		mm
inches  Note: Set to "0" (zero) if mm entered

Step 5)   Enter the focal length of each of your
              eyepieces in millimeters and the apparent
              field of view of each of your eyepieces
              in degrees. You can use the dropdown box
              below to look up the FOVs for common
              eyepieces.

    Note: Enter "0" (zero) for any unused positions

Eyepiece 1

FL mm

 FOV °

Eyepiece 2

FL mm

 FOV °

Eyepiece 3

FL mm

 FOV °

Eyepiece 4

FL mm

 FOV °

Eyepiece 5

FL mm

 FOV °

Eyepiece 6

FL mm

 FOV °

Eyepiece 7

FL mm

 FOV °

Eyepiece 8

FL mm

 FOV °

Eyepiece 9

FL mm

 FOV °

Eyepiece 10

FL mm

 FOV °

Eyepiece 11

FL mm

 FOV °

Eyepiece 12

FL mm

 FOV °

Eyepiece 13

FL mm

 FOV °

Eyepiece 14

FL mm

 FOV °

Eyepiece 15

FL mm

 FOV °

Eyepiece 16

FL mm

 FOV °

Eyepiece 17

FL mm

 FOV °

Eyepiece 18

FL mm

 FOV °

Eyepiece 19

FL mm

 FOV °

Eyepiece 20

FL mm

 FOV °

Step 6)  Calculate and display table