1)When the film speed dial (14) is set at "DX" " the camera automatically reads the film speed of the film magazine, so manual film speed setting is unnecessary. This is only effective with "DX" type films.

2)When non-Ding type film is used, turn the film speed dial (14) to set the camera for the rating of the film.4.butkus.org

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Konica Minolta TC-X manual