![[Numbering scheme]](Numbering.gif)
I numbered the squares from 1 to 12. Squares 1 and 7 are always light, they are used as common inputs for the electronics.
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135 film cassettes contain a so called DX code.
You will find 12 squares on a cassette,
each square can be light (non-isolating) or dark (isolating).
By use of electronics, a photo camera can read the code. I numbered the squares from 1 to 12. Squares 1 and 7 are always light, they are used as common inputs for the electronics. |
| 2 | 3 | 4 | |
| 12 |  |
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| 20 | |
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| 24 | |
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| 36 | |
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| 48 | |
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| 60 | |
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| 72 | |
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| Stops | 5 | 6 |
| -0.5 to +0.5 | |
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| -1.0 to +1.0 | |
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| -1.0 to +2.0 | |
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| -1.0 to +3.0 | |
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| ISO | 8 | 9 | 10 | 11 | 12 |
| 25/15° | |
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| 32/16° | |
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| 40/17° | |
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| 50/18° | |
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| 64/19° | |
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| 80/20° | |
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| 100/21° | |
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| 125/22° | |
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| 160/23° | |
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| 200/24° | |
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| 250/25° | |
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| 320/26° | |
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| 400/27° | |
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| 500/28° | |
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| 640/29° | |
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| 800/30° | |
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| 1000/31° | |
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| 1250/32° | |
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| 1600/33° | |
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| 2000/34° | |
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| 2500/35° | |
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| 3200/36° | |
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| 4000/37° | |
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| 5000/38° | |
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