Super 8 Cartridge Notch Ruler

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Cartridge notch ruler, click for larger view

Important note: if you examine your camera please share the results on the discussion page, linked above. Thank you, WikiAdmin 10:39, 3 January 2006 (PST)

This Super 8 Cartridge Notch Ruler can be used to inspect the mechanism in your own camera. Print out the PDF version and you can examine the pins or levers in your camera's film chamber to see which film speeds it can detect.

There is one caveat - the camera may have one more ASA setting than the number of notches that it can detect. For example, if the camera has only one pin that is a switched by a certain size notch, it actually has two ASA settings - one if it detects the notch and another if it does not. If the camera has 3 pins, it may have 4 ASA settings, etc. You cannot determine the default ASA setting by inspection.
Printable Super 8 Cartridge Notch Ruler: use this PDF format ruler for actual-size printing.

Measuring a Canon 310XL

You can use this ruler to determine how a camera will handle notches for new film stock Here is an example. The Canon 310XL instruction manual states that the meter understands 3 film speeds: 40T, 160T, and 250T. What will the camera do with Ektachrome 64T? Using the ruler, it appears that a 64T notch will be read as 160T due to Canon's placement of the notch reading switches. Testing with an actual E64T cartridge confirms this is true.

Measuring a Minolta XL-601
Measuring a GAF 505 XLM
Measuring a Bolex Compact 233S
Measuring a GAF 738
Measuring a Sankyo Super CM 880


Cartridges Measured[edit]

These are measurements taken directly from cartridges. Add to or correct this information but, please, only if you measure a cartridge yourself.

Film stock Distance to speed notch Has filter notch? Color balance Unfiltered ASA Source
Ektachrome 64T 0.7 inch 17.78mm Yes Tungsten 64 ASA Reed Sturtevant January 10, 2006
K40 0.8 inch 20.32mm Yes Tungsten 40 ASA Reed Sturtevant May 18, 2005
KII 0.8 inch 20.32mm Yes Tungsten 40 ASA Reed Sturtevant May 18, 2005
Ektachrome 160 Type G 0.4 inch 10.16mm No Daylight 160 ASA Reed Sturtevant May 18, 2005
Ektachrome 160 Type A 0.5 inch 12.7mm Yes Tungsten 160 ASA Reed Sturtevant May 18, 2005
KACCEMA reloadable cartridge 0.7 inch 17.78mm No (empty cart - daylight assumed) acts as 64T/40D From filmshooting.com forums, May 20, 2005
Ektachrome 125T VNF 0.55 inch 13.97mm Yes Tungsten 125 ASA christoph, oct, 2005
7276 Plus-X (old) 0.7 inch 17.78mm No B/W stock 50ASA D / 40ASA T christoph, oct, 2005
7278 Tri-X (old) 0.4 inch 10.16mm No B/W stock 200ASA D / 160ASA T christoph, oct, 2005
7265 Plus-X (new) 0.5 inch 12.7mm No B/W stock 100ASA D / 80ASA T christoph, oct, 2005
7266 Tri-X (new) 0.4 inch 10.16mm No B/W stock 200ASA D / 160ASA T christoph, oct, 2005

Related Links[edit]

The ruler is based on information from the standard SMPTE 166-2004 as described by the following sources:

There is an alternate ruler and flowchart published by Friedemann Wachsmuth. But be aware that he misreads the Super 8 Wiki ruler, in the link above Kodak states that 0.8 inch means Tungsten 40 ASA, not 0.7 inches as his example states: