EO Tech Tools

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Select a Tech Tool: Gaussian Beams Simple Magnifier Koehler Illumination Focal Length SAG 1951 USAF Resolution Laser Spot Size

In addition to our comprehensive archive of Application Notes, Frequently Asked Questions, Glossary terms, and a variety of other resources, we now have technical calculators based on commonly used and referenced equations in the Optics, Imaging and Photonics industries. View EO Tech Tools Equations to see the equations used for each calculation. Should you have any questions, suggestions or need further information, please feel free to Contact Us.

Focal Length Calculator

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Relate optical and mechanical parameters of simple lenses in order to ease integration into application assemblies. Select index from list of EO's own optical substrates to help calculate focal lengths and principal points of any standard lens.

R1 (mm)		OR Plano
R2 (mm)		OR Plano
Object Space Index, nOS
Lens Index, nL		-- B270/S1 BaSF1 CaF2 Corning Pyrex 7740 Fused Silica Germanium N-BaF10 N-BaK1 N-BaK4 N-BAL35 N-BaSF64 N-BK7 N-F2 N-K5 N-LaK14 N-LaK22 N-LaK8 N-LaSF44 N-LaSF9 N-SF10 N-SF11 N-SF14 N-SF15 N-SF18 N-SF2 N-SF5 N-SF56 N-SF57 N-SF6 N-SF8 N-SK11 N-SK14 N-SSK8 Sapphire* S-BaH11 Schott BoroFloat Schott Zerodur S-FSL5 Silicon S-LAH79 S-TIH13 ZnSe
Image Space Index, nIS
Center Thickness, CT (mm)

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Effective Focal Length, EFL (mm)	--
Back Focal Length, BFL (mm)	--
Front Focal Length, FFL (mm)	--
Primary Principal Point, P (mm)	--
Secondary Principal Point, P'' (mm)	--
Shift in Nodal Points (mm)	--