Magnification Calculator

Telescope Specifications
 
Eyepiece Specifications
Aperture Diameter (inches) user input Eyepiece focal length 
(mm)
user input
Focal Ratio 
(f/#)
user input Magnification
(power)
Focal Length (inches) Eyepiece Apparent FOV 
(degrees)
user input
Focal Length 
(mm)
True Field of View 
(degrees)
Aperture 
(sq. inches)
True Field of View
(arcminutes)
Barlow (x) user input Directions:
  • Enter values for the "user input" blocks - then press the "Calculate" key
  • Eyepiece Apparent FOV Table - A listing of popular manufacturers eyepieces and their apparent field of view's (FOV).
Telescope Characteristics
Resolving Power 
(arcseconds) 
Limiting Magnitude (ML) Table

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Version 4.1 by Matt Oltersdorf 2000 04 10 10:00 UTC