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Kodak Wratten Gelatin Filter 75mm/3x3" Blue Series Color Conversion #80C

$34.97


1497825 Kodak Kodak Wratten Gelatin Filter 100mm ..

I’m a curious chap, and used to answering questions by first gathering all the data I can. So, working within the theme of my research I decided to put together a database of spectral response curves for commonly available colour filters. The problem of course was that nobody has that data. None of the manufacturers I researched have spectral response data for standard colour filters. Lucky for us colour filters for astronomy find their origin in terrestrial film photography. Some time ago Kodak established a colour filter standard called the Wratten #. The filter numbers we are used to seeing in astronomy are in fact these Wratten #’s from the original Kodak system. So, where does one find spectral data for Kodak Wratten filters? There was apparently a photography book published by Kodak that is out of print now, but I instead found the data in the “CRC Handbook of Chemistry & Physics, 1st Student Edition” which just happens to be sitting on my shelf at work. The data tables in the book also included the % transmissivity (photopic), a parameter that filter manufacturers do quote. You can download a PDF of the Wratten filter tables from the chapter.

The absorption and transmission characteristics of Kodak Wratten filters are published in the Kodak Photographic Filters Handbook (Publication No. B-3), which includes tabulations of spectral data at various wavelengths. A typical visible light absorption spectrum for one of these filters, the Wratten number 34a, is illustrated in Figure 1. In this figure, absorption (diffuse density) is plotted as a function of wavelength from 300 to 700 nanometers.

Kodak Wratten filters (87C) - IR photo Started Apr 13, 2006 ..

  • ^ Kodak Wratten Filters, Fourth Edition 1969, Kodak Limited London.
  • KODAK Filters Yellow KODAK WRATTEN Gelatin Filters 2B Pale Yellow

    The absorption and transmission characteristics of Kodak Wratten filters are published in the Kodak Photographic Filters Handbook (Publication No. B-3), which includes tabulations of spectral data at various wavelengths. A typical visible light absorption spectrum for one of these filters, the Wratten number 34a, is illustrated in Figure 1. In this figure, absorption (diffuse density) is plotted as a function of wavelength from 300 to 700 nanometers.

    A compilation of bar charts for the common Kodak Wratten color filters are listed in Table 1. Use this table as a reference in choosing filters to enhance contrast in stained specimens using black & white photomicrography.