LensForge Icon

Using the index fitter

How to fit refractive index data:

  1. Open the index fitter window (menu command Tools > Index fitter)
  2. Change the glass name and version using the form; enter any other form data desired.
  3. Click the '+' button below the data table to create wavelength, index pairs
  4. Modify the numbers in the table
  5. Choose a functional form from the menu at the bottom left
  6. Enter rough values for the coefficients, or press the Guess button
  7. Press the Fit button to perform the fit
  8. If the result is satisfactory, drag the glass from the drop box at the upper right of the window and drop it into the table in the Glasses window of a lens design in order to save it.

image

See also