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The Kodak 4x4" #106 Amber Special Dye Wratten 2 Optical Gel Filterconverts an S-4 type photocell response (such as found in a densitometer) to the even-luminosity response of the human eye. Wratten 2 Improvements More…

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The Kodak 4x4" #106 Amber Special Dye Wratten 2 Optical Gel Filterconverts an S-4 type photocell response (such as found in a densitometer) to the even-luminosity response of the human eye.
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