# 感光度

## 兩種標度間的轉換

${\displaystyle S=10^{\left({S^{\circ }-1}\right)/10}}$

${\displaystyle S^{\circ }=10\log S+1}$

### 現用標度的比較

ISO運算式標度
（ASA標度）
ISO對數式標度
（DIN標度）
GOST
（蘇聯1987年前期）

1 Svema Micrat-orto, Astrum Micrat-orto
3 2.8 Svema MZ-3, Astrum MZ-3
6 原版Kodachrome
8 10° Polaroid PolaBlue
10 11° Kodachrome 8 mm底片
12 12° 11 Gevacolor 8 mm反轉片
16 13° 11 Agfacolor 8 mm反轉片
20 14° 16 Adox CMS 20
25 15° 22 ORWO NP15, 舊版Agfacolor, Kodachrome 25
32 16° 22 ORWOcolor NC16, Svema CO32D, Kodak Panatomic-X
40 17° 32 Svema TsNL32, Kodachrome 40 (movie)
50 18° 45 ORWOchrom UT18, ORWOcolor NC18, Svema DS4, Fuji RVP（Velvia
64 19° 45 ORWOcolor NC19, Kodachrome 64, Ektachrome-X
80 20° 65 ORWO NP20, Svema TsNL65, Ilford Commercial Ortho
100 21° 90 ORWOchrom UT21, ORWOcolor NC21, ORWO UN54, Svema TsNL90, Kodacolor Gold, Kodak T-Max (TMX), Provia
125 22° 90 Astrum Color Negative 125, 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 ORWO N75, Kodak Tri-X Pan Professional (TXP)
400 27° 350 ORWO NP27, ORWO N74+, Kodak T-Max (TMY), Tri-X 400, Ilford HP5+
500 28° 350
640 29° 560 Polaroid 600
800 30° 700 ORWO NP30, 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°
12800 42°
25600 45°
51200 48°
102400 51°

## 參考

1. ^ ISO 2721:1982. Photography—Cameras—Automatic controls of exposure頁面存檔備份，存於網際網路檔案館）(paid download). Geneva: International Organization for Standardization頁面存檔備份，存於網際網路檔案館）.
2. ^ 戴淮清 《攝影入門》 1952 新加坡星洲日報社