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I.S.O.

In the earlier days of film, ISO was used to indicate how sensitive to light a particular type of film was, and back then was called ASA in the American continent, and DIN in the European continent.
Today the ISO indicates the sensitivity of the film or digital chip to light.
The higher the ISO the greater the sensitivity to light (and the less light that is needed to successfully record an image).



I.S.O stands for International Standards Organization.
ASA stands for American Standards Association.
DIN stands for Deutsches Institut für Normung.
Picture
Picture

Below is a conversion Table ISO = ASA = DIN

I.S.O.
A.S.A.
D.I.N.
50
50
18º
100
100
21º
200
200
24º
400
400
27º
800
800
30º
1600
1600
33º
3200
3200
36º
6400
6400
39º
ISO Scales
Below is a table with ISO scales (1 & 1/3 stops)
Full Stops
1/3 Stops
100
100
.
125
.
160
200
200
.
250
.
320
400
400
.
500
.
640
800
800
.
1000
.
1250
1600
1600
.
2000
.
2500
3200
3200

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