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Comparative table of ISO, ASA , DIN and GOST

See the article ISO and ASA  for general information on sensitivity and the history of these representations.

Today we have two standards in use as a part of ISO Arithmetic which is the same as the old ASA scale and Logarithmic, which is the same as the old DIN scale.

With ASA and ISO Arithmetic the number doubles with each increase of one stop, while with DIN and ISO logarithmic the number increases by 1 with each increase of a third of a stop, so 3 with one stop. So ISO Logarithmic/DIN of 24 which is the equivalent of ISO 200 Arithmetic/ASA, and  27 = ISO 400,  when represented together they often appear as ISO400/27

Today the DIN representation is usually missed, except with some films and we stick to one e.g. ISO 400.

 
ISO arithmetic scale
+ ASA scale
ISO log scale
+ DIN scale
GOST
(Soviet pre-1987)
Example of film stock
with this nominal speed
6 9   original Kodachrome
8 10   Polaroid PolaBlue
10 11   Kodachrome 8 mm film
12 12 11 Gevacolor 8 mm reversal film
16 13 11 Agfacolor 8 mm reversal film
20 14 16 Adox CMS 20
25 15 22 old Agfacolor, Kodachrome 25
32 16 22 Kodak Panatomic-X
40 17 32 Kodachrome 40 (movie)
50 18 45 Fuji RVP (Velvia)
64 19 45 Kodachrome 64, Ektachrome-X
80 20 65 Ilford Commercial Ortho
100 21 90 Kodacolor Gold, Kodak T-Max (TMX), Provia
125 22 90 Ilford FP4+, Kodak Plus-X Pan
160 23 130 Fujicolor Pro 160C/S, Kodak High-Speed Ektachrome
200 24 180 Fujicolor Superia 200
250 25 180 Tasma Foto-250
320 26 250 Kodak Tri-X Pan Professional (TXP)
400 27 350 Kodak T-Max (TMY), Tri-X 400, Ilford HP5+
500 28 350  
640 29 560 Polaroid 600
800 30 700 Fuji Pro 800Z
1000 31 700 Kodak P3200 TMAX, Ilford Delta 3200 (see text below)
1250 32    
1600 33 14001440 Fujicolor 1600
2000 34    
2500 35    
3200 36 28002880 Kodak T-Max (TMZ)
4000 37    
5000 38    
6400 39    

This table based on information from Wikipedia.

 


 <<  ^  Exposure Article Route   ^  >>    End of of article route

for details on Exposure Article Route see the Exposure  page

 


By: Keith Park   Section: Exposure Key:
Page Ref: Ref_iso Topic:  Exposure  Last Updated: 08/2009
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