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Equations and corresponding legends for each of our EO Tech Tools.
| FOS | Power of Surface 1 |
| FIS | Power of Surface 2 |
| F | Lens Power |
| nOS | Object Space Index |
| nL | Lens Index |
| nIS | Image Space Index |
| R1 | Radius of Surface 1 |
| R2 | Radius of Surface 2 |
| CT | Center Thickness |
| P | Primary Principle Point |
| P' | Secondary Principle Point |
| EFL | Effective Focal Length |
| BFL | Back Focal Length |
| FFL | Front Focal Length |
| NPS | Nodal Point Shift |
| fF | Front Focal Point |
| fR | Rear Focal Point |
| ? | Wavelength |
| zR | Rayleigh Range |
| z | Axial Distance |
| ?(z) | Half Beam Diameter |
| ?0 | Beam Waist |
| b | Confocal Parameter |
| ?R | Rayleigh Half Diameter |
| R(z) | Radius of Curvature |
| ? | Half Angle Divergence |
| d1 | Source to Lens 1 Distance |
| d2 | Lens 1 to Lens 2 Distance |
| d3 | Lens 2 to Spot Diameter Distance |
| DL1 | Diameter of Lens 1 |
| DL2 | Diameter of Lens 2 |
| FL1 | Focal Length of Lens 1 |
| FL2 | Focal Length of Lens 2 |
| Dsource | Source Diameter |
| Dspot | Spot Diameter |
| NAinput | Input Numerical Aperture |
| NAoutput | Output Numerical Aperture |
| DI | Input Beam Diameter |
| DO | Output Beam Diameter |
| ?I | Beam Divergence |
| L | Working Distance |
| R | Radius of Curvature |
| D | Diameter |
| MP | Magnifying Power |
| FL | Focal Length |
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