ASA / DIN is the standard photosensitivity film and photo paper, which was in use in photography before the new ISO standard came into force.

Also on photographic equipment you can find the GOST standard. This is especially true for the cameras of the USSR.

ASA (ANSI) is the American Standards Institute.

ANSI was originally formed in 1918 when five engineering societies and three government agencies founded the American Engineering Standards Committee (AESC). In 1928 the committee became known as the American Standards Association.SO - English. American Standards Association). In 1966, the ASA was reorganized and became the United States of America Standards Institute (USASI - United States of America Standards Institute). The current name was adopted in 1969.

Although ANSI itself does not develop standards, the Institute oversees the development and use of standards through the accreditation of standards development organizations' procedures. ANSI accreditation means that the procedures used by standards developing organizations meet the Institute's requirements for openness, balance, consensus, and due process.

DIN is the German Institute for Standardization

DIN - from the German Deutsches Institut für Normung - the German Institute for Standardization. It was founded in December 1917 in Germany. Over the years of its existence, it has changed its name three times - "Committee for the Standardization of German Industry", "German Committee for Standardization". In 1975 DNA was renamed Deutsches Institut für Normung. On old German cameras, the sensitivity was set to DIN.

The main task of DIN is the development of regulatory and technical documentation (standards, specifications, rules, etc.). For this purpose, DIN organizes the work of 26 thousand experts from various fields of science and technology. Its members are enterprises, unions, state organizations, trade firms and scientific institutes. According to an agreement between DIN and the German government, DIN is the leading German national organization for standardization and represents Germany's interests in this area at the international level. The intensive work of German experts in the field of international standardization and standardization has made DIN one of the generally recognized world leaders in the development of standards and other normative documents. In total, DIN includes 74 normative committees involved in the development of standards and other documentation.

GOST - State Standard of the CIS countries

The concept in photography was also widely encountered after the adoption of new ISO standards for the sensitivity of materials. For full compliance, the photosensitivity according to GOST was later equated to the accepted ISO. On cameras of the USSR of early production, you can find the DIN / GOST marking.

To meet the requirements of the technical regulations of the Eurasian Economic Union and assess compliance with the requirements of the technical regulations of this union, interstate and international standards are applied on a voluntary basis. In their absence, before the adoption of interstate standards, the national standards of the member states of the union may be applied.

For each technical regulation, the Eurasian Economic Commission approves two lists of standards. One contains the standards necessary to meet the requirements of the technical regulation, and the second contains the standards for the rules and methods for testing products. Application on a voluntary basis of the standards included in the first list is a sufficient condition for compliance with the technical regulations of the Union. By July 2016, lists of standards for 33 technical regulations of the EAEU were approved. They include more than 11 standards, of which about 600 are developed on the basis of ISO, IEC and UNECE international standards (3100%) and 26,4 are based on European counterparts (865%).

what is din. camera with printed ASA/DIN scale

ISO - International Institute for Standardization.

The values DIN \ ASA were also plotted in the form of a sensitivity scale on exposure metering devices. Light sensitivity scale - a sequence of number values ​​accepted in a particular sensitometric system photosensitivity... There are two types of scales: arithmetic and logarithmic. The DIN system had a logarithmic scale, and ISO can combine arithmetic and logarithmic readings of sensitivity units, denoted by a fraction.

The ASA photographic exposure system, originally defined in ASA Z38.2.1 (since 1943) and ASA PH2.5 (since 1954), together with the DIN system (DIN 4512 since 1934) became the basis for the ISO system (since 1974), and is currently used worldwide (ISO 6, ISO 2240, ISO 5800, ISO 12232).

Light sensitivity scales ISO / ISO °, ASA, DIN, GOST

DIN

ISO

ISO°

SO

GOST new

GOST old

3

1,6

3

1,6

1,6

1,4

4

2

4

2

2

2

5

2,5

5

2,5

2,5

2,8

6

3

6

3

3

7

4

7

4

4

4

8

5

8

5

5

5,5

9

6

9

6

6

8

10

8

10

8

8

11

10

11

10

10

11

12

12

12

12

12

16

13

16

13

16

16

14

20

14

20

20

22

15

25

15

25

25

32

16

32

16

32

32

17

40

17

40

40

45

18

50

18

50

50

65

19

64

19

64

64

20

80

20

80

80

20

21

100

21

100

100

130

22

125

22

125

125

23

160

23

160

160

180

24

200

24

200

200

250

25

250

25

250

250

26

320

26

320

320

350

27

400

27

400

400

500

28

500

28

500

500

29

640

29

640

640

700

30

800

30

800

800

1000

31

1000

31

1000

1000

32

1250

32

1250

1250

1400

33

1600

33

1600

1600

2000

34

2000

34

2000

2000

35

2500

35

2500

2500

2800

36

3200

36

3200

3200

4000

37

4000

37

4000

4000

38

5000

38

5000

5000

5600

39

6400

39

6400

6400

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