Rainbow Research Optics Offers complete optical data design. They provide the following charts to help you determine your specific needs.  Click on any of the links to go directly to each chart.  The following are the different charts offered on their website:  Lens TerminologyFocal Length Formulas for Singlet Lenses & MirrorsEffective Focal Length of Two Thin LensesF-Number (F/#)Numerical Aperture (N/A)Sagitta (Sag)Using Wedged WindowsSelecting a Prism, and Waveplates.  For more information on any of Rainbow Research Optics services visit www.rainbowoptics.com.