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Focal Length of Your Scope in millimeters (FLs)
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Aperture of Scope in Inches (APi)
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If you know the aperture of your scope in inches, enter it to the left. If you know it in mm, enter it to the right.
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Aperture of Scope in mm (APm)
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Barlow Power
(Enter Barlow Magnification)
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Eyepiece Type/Description
(replace with your own)
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Eyepiece Focal Length (FLe)
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Eyepiece Apparent Field of View (FOV) °
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Exit Pupil
(EX=APm/M)
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Eyepiece
Power
(M=FLs/FLe)
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Eyepiece True Field of View ° (T=FOV/M)
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Barlow Factor
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