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Telescope Parameters Calculator

A few useful calculations for your telescope in case you need them or you want to select an eyepiece.

Please enter a value for all the fields marked with (*).

INPUT values

Aperture*: mm OR inch
Focal Length*: mm
Eyepiece Focal Length: mm
Apparent Field: degrees
Barlow Lens: X

Focal Ratio: mm
Magnification Range. From: X to X
Light Grasp: X
Resolving Power: arc seconds
Limiting Magnitude:
Magnification: X
Real Field of View: degrees
Exit Pupil: mm

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