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last modification: february 10th, 2012

ASA - DIN - ISO film speeds

Actual standarized is only ISO for film speeds. But common is ASA (years ago also in Europe DIN).

The algorithms:

ASA : doubling the number means doubbling the filmspeed - at your camera: doubbling one ASA step is one f-stop (aperture opening)

 

DIN : number plus 3 means doubling the film speed -  at your camera: every step of 3 DIN is one f-stop (aperture opening) or 1 DIN is 1/3 f-stop

ASA

DIN

ISO

6

9

6/9°

12

12

12/12°

25

15

25/15°

40

17

40/17°

50

18

50/18°

64

19

64/19°

100

21

100/21°

160

23

160/23°

200

24

200/24°

400

27

400/27°

800

30

800/30°

1600

33

1600/33°

3200

36

3200/36°

6400

39

6400/39°

Filmspeeds for common reverse Super 8 films are mostly marked for artificial light (without wratten filter - 85). For daylight you must use this filter, which reduces the amount of light passing onto the film surface. This is the reason why the same film “has different filmspeeds”.

A Kodak Kodachrome40 has 40 ASA in artificial light (without Wratten filter) and 25 ASA in daylight. This means for usage, in daylight the f-stop must be 2/3 more open.

A Kodak Ektachrome 64T film (artificial / Tungsten) used without Wratten filter 85B has 64 ASA. Used with Wratten 85B for dayligth usage it has only 40 ASA. Also for this film the f-stop must be 2/3 more open in daylight...

And now it is depending of the film speed checker inside your camera: Most of available “younger” cameras checks only two different positions of film speed notches 40 ASA or 160 ASA. In this cameras a new Ektachome 64T Super8 film will be recognized as 40 ASA film if you do not any correction. This means the film will be overexposed with 2/3 f-stop. Details see Tech tips....

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