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Topic: schmalfilm magazine introduces new Kodak Super 8 film Ektachrome 100D
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Joerg Polzfusz
Jedi Master Film Handler
Posts: 815
From: Berlin, Germany, Europe, Earth, Solar System
Registered: Apr 2006
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posted April 12, 2010 10:31 AM
Hi,
the combination of both notches ("upper" and "lower") is needed for the camera to automatically detect the film's speed (e.g. 25 ASA, 40 ASA, 100 ASA, 160ASA, ...). The "lower" notch is needed to detect the film's type (Super8 differs only between "daylight" and "non-daylight" (Tungsten)).
The "lower" notch should also prevent the cameraman from accidentally enabling the internal "Wratten 85" filter when having loaded a "daylight balanced film". Reason: The only purpose of a "Wratten 85" filter is to use a "tungsten balanced film" in daylight. However -when having loaded a "daylight balanced film"- it's best to also manually disable the "Wratten 85" filter as some manufacturer "forgot" to integrate this automatism. (And you wouldn't find any info about this in your manual.)
Jörg
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