What is and how 35mm DX codes work?

A blog post by Darkroom 8 Team

DX code allows film cameras equipped with reading system to automatically recognise the ISO speed of the film, the number of exposures and the latitude of the exposure of this film.

We found that the number of point and shoot film photographers is getting more and more recently. However most of the point and shoot camera unable to adjust iso, aperture and shutter speed. Hence, we unable push or pull of film when shooting like SLR camera. By understanding DX code, you can alter it by scraping the black paint off the appropriate grid with anything that’s sharp or use a marker pen fill up the silver grid in order to proceed push or pull shooting. Other than that, there are total 12 cells grid (with black and silver cells) on the back of the film cassette. The silver cells is conductive while the black cells is non-conductive which have indicate the ISO speed of the film, the number of exposures and the latitude of the exposure of this film. Below is more information of the 12 cells grid.

• 1 and A : Always silver cells and it act as an electrical contact.

• 2~6 : Indicate the ISO of the film.

• B,C,D : Indicate the number of exposure of the film.

• E, F : Indicate the latitude of the exposure of this film.

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