Glass Compare
Compares 2 or 3 glass catalogs to assist in finding glasses used in visible light with similar index and dispersion characteristics.
PrimaryThe name of the primary glass catalog. This catalog is used as the reference catalog.
SecondaryThe name of the secondary glass catalog. Only glasses which are considered equivalent to those in the primary catalog will be listed.
TertiaryThe name of the tertiary glass catalog. Only glasses which are equivalent to those in the primary catalog will be listed.
Index ToleranceThe maximum allowed difference in index at d-light for a glass from the secondary or tertiary catalog to be considered equivalent to a glass from the primary catalog.
Abbe ToleranceThe maximum allowed difference in Abbe number at d-light for a glass from the secondary or tertiary catalog to be considered equivalent to a glass from the primary catalog.
ShowEither all glasses in the primary catalog may be listed, or just those used in the current lens file and configuration.
SortResults may be sorted by index at d-light, name, or Abbe number at d-light.
Discussion
This feature only lists glasses that are used in the F-C wavelength range. If "Show Used Glasses" is selected, the name of the glass displayed in the glass column of the lens data editor is used to determine if the glass from the primary catalog is used by the current lens and configuration. However, there is no check made that the glass from the primary catalog is actually used by the lens. For example, if the current lens uses glass A1 from catalog X, the primary catalog is Y, and Y also contains a glass called A1, then the data for A1 from catalog Y will be displayed, even though the lens actually uses the A1 as defined in catalog X. If more than one catalog uses the same name for different glasses, great care should be taken to verify all data is for the intended glass.
Next: