Filtration Techniques. Or How to print four different soundtracks Onto one piece of film To three different densities. Andrew Wales Technicolor London. From Negative to Print. Sound negative type - (Base Density) Print stock Soundtrack lamp age * Filters set up & condition *
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Soundtrack lamp age *
Filters set up & condition *
* Trend factors - Unlikely to have sudden movement.Factors affecting print density
Agfa ST8D Kodak 2383
Agfa ST9 Kodak 2393
Kodak 2378 Fuji 3519
Kodak 2376 Fuji 3519D (Hi Con)
Total of 25 combinations
Collection of colour correcting filters selected so that when printed through the negative, gives a print density on aim.
Yellow filter (e.g. Wratten 12) + UV filter if required.
Red and yellow CC filters (+ neutral density if required) to give neutral print density aim.
Red filter (e.g. Wratten 29 or Agfa L622) + neutral density filter to give cyan print density aim.