Does anybody have a complete set of DX-codes "patterns" so one could manipulate the DX code on a roll of film (by scraping fields so they become conductive, and hiding fields with gaffer-tape to make them non-conductive ?) 400 ASA looks like this, upper row 100110, and lower row 100110. (If "1" means conductive, i.e shows the silver, and "0" is black.)

100 ASA then looks like this, upper 101010, lower 100100.

But how does ASA: 12,25,50,64,80,etc. look ? Is there a system to follow ? Does anybody know all (or most) filmspeeds ? Please let me know ! :-)

Martin Rusch, Paris

-- Martin Rusch (martinirosso@hotmail.com), February 03, 1999

Answers

Here you go. I copied this from a thread in the photo.net archives.

              =========================  <-- Light trap

              +---+---+---+---+---+---+

            +-| 1 | 2 | 3 | 4 | 5 | 6 |

 spool -->  | +---+---+---+---+---+---+

            |_| 7 | 8 | 9 | 10| 11| 12|

              +---+---+---+---+---+---+

              -------------------------



FILM                   FILM                EXPOSURE

SPEED  2 3 4 5 6       LENGTH  8 9 10      LATITUDE   11 12

----------------       --------------      ----------------

  25         *          12     *           +/- 1/2

  32           *        20       *         +/- 1      *

  40         * *        24     * *         +2/-1         *

  50   *     *          36         *       +3/-1      *  *

  64   *       *         -     *   *

  80   *     * *         -       * *

 100     *   *          72     * * *

 125     *     *

 160     *   * * 

 200   * *   *

 250   * *     *

 320   * *   * *

 400       * *

 500       *   *

 640       * * *

 800   *   * *

1000   *   *   *

1250   *   * * *

1600     * * *

2000     * *   *

2500     * * * *

3200   * * * *

-- Fritz M. Brown (brownf{DHWTOWERS/TOWERS3/brownf}@dhw.state.id.us), February 03, 1999.