Calculate Telescope Parameters

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Telescope - Optical Parameters

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

CALCULATED values

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