What does Asa and Din mean

DIN / ASA / ISO

The standard specification for light sensitivity today is the ISO value. DIN and ASA are specified for the ISO value. Often (almost all digital cameras) the sensitivity is named ISO, although only the ASA value is displayed due to the legibility. The respective scales can be converted into the other relatively easily.

DIN, ASA and ISO describe the light sensitivity of film material or digital cameras in photography.

DIN - German Institute for Standardization
ASA - American Standard Association
ISO - International Standard Organization

The respective scales can be converted into the other relatively easily. The initial value is 12. Here, ASA and DIN mark the same light sensitivity. If the DIN value is increased by three each time, the ASA value and the light sensitivity double, i.e. that is, less light is required for correct exposure. If the DIN values ​​are reduced by three levels, the ASA value is halved, and thus also the light sensitivity. This leads to rounding inaccuracies in the ASA values. B. 15 DIN has an ASA value of 25 and not 24.

The standard specification for light sensitivity today is the ISO value. DIN and ASA are specified for the ISO value. Often (almost all digital cameras) the sensitivity is named ISO, although only the ASA value is displayed for reasons of legibility.

At the same time, the values ​​also (with restrictions) allow conclusions to be drawn about the grain or the noise behavior of films or digital cameras.

 

Conversion table

DIN

ASA

ISO

Increase in photosensitivity


9

6

6/9°

10

8

8/10°

11

10

10/11°

12

12

12/12°

13

16

16/13°

14

20

20/14°

15

25

25/15°

16

32

32/16°

17

40

40/17°

18

50

50/18°

19

64

64/19°

20

80

80/20°

21

100

100/21°

22

125

125/22°

23

160

160/23°

24

200

200/24°

25

250

250/25°

26

320

320/26°

27

400

400/27°

 

Relationship between ISO value and image quality

Further information on light sensitivity can be found at:

 

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