This online tool allows you to convert the optical density in optical transmission and vice versa. It is useful to calculate the optical transmission of a neutral density filter or to find out the right density for a desired transmission of a OD-filter.
Our SCHOTT color glass filter calculator is a great (if not the only) online tool, that allows to do custom analysis of the spectral transmission and the internal transmission of any SCHOTT color glass filter material. You can zoom into the transmission axis of the computed curve and select, whether you want to see the whole available spectrum or you can zoom to a custom wavelength range. The calculated result is supplied as a generated curve that can be saved or printed for your reference. The raw filter transmission data has been supplied to us by SCHOTT.