Reference

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°	1400–1440	Fujicolor 1600
2000	34°
2500	35°
3200	36°	2800–2880	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