UVa - Ultraviolet a
H = Haze
0 = Very Light Yellow
1 = Light Yellow
2 = Medium Yellow
3 = Dark Yellow
Gb = Graduated Yellow (sky filter)
Gr = Green
GGr = Graduated Green (sky filter)
Or = Orange
Rh = Bright Red (Rot Hell) (Wratten 29)
Rm = Medium Red (Rot Mittle) (Wratten 70)
Rd = Dark Red (Rot Dunkle) (Wratten 87)
A = Type A in daylight (Wratten 85)
B = Type B in daylight (Wratten 85B)
F = Daylight with clear flash (Wratten 80D)
PF = Photoflood with daylight (Wratten 80A or 80B?)
The Type A filter allowed Type A films to be used in daylight. Type A films (now all discontinued) were tungsten-balanced films balanced for 3400K light, which came out of the economical consumer photoflood lamps. The professional tungsten balanced films (Type B) were balanced for 3200K professional tungsten lights.
The filters for using daylight in tungsten and vice versa are rather marginal, significant speed loss, and hard to make a really stable one that didn't fade.
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