Illumination Calculators
Always use the same units (inches or mm) in each calculation (unless indicated).
Enter your numbers into the 'recessed' cells. Press the TAB key to recalculate.
Other formulas you'd like to see? Todd@fiberopticsystems.com
Illumination Circle Size	Bundle Diameter	Fiber NA	Distance	Circle Size
NA = Numerical Aperture is an angle measurement and is specified by the fiber manufacturer.
Size of a Collimated Beam	NA	Bundle Diameter	Lens Focal Length	Beam Diameter at Focal Length	Divergence Full Angle (radians)	Divergence Full Angle (degrees)	Distance From Lens Focus	Beam Diameter at Distance
Convert Feet	Feet	Inches	mm	Meters
Convert mm	mm	Inches	Feet	Microns
Convert meters	Meters	Feet	Inches	mm

Automatic recalculation