Polaroid T-64 - Manual (Page 3)

Reciprocity law failure
A wide range of shutter speeds can be used without loss of film speed.
For longer exposure times, some exposure compensation is suggested.
Film Data Sheet
Technical Data
T-64 Tungsten
Instant Color Peel-Apart Films
Reciprocity: The ability of the film to respond in a constant
manner to a constant exposure (light intensity x time).
Reciprocity failure occurs during very long or very short
exposures, requiring the photographer to increase exposure.
Spectral Sensitivity: Shows the equivalent energy needed
at each wavelength in order to activate the emulsion so that it
produces a neutral density of .75. Shutter
Speed
1/4000 to
1/30
1/15 to 4 8 16 32 64
Exposure
Adjustment
Not
recommended
+2/3 stop None +1/3 stop +1/3 stop +1/3 stop
Color
Compensating
Filter
- None None None CC05B CC05B
Exposure Time (seconds)
Relative Log Exposure
.001" .01" .0001" .1" 10" 1" 100"
Reciprocity Law Failure
0
.2
.4
.6
.8
1.0
1.2
1.4
1.6
1.8
Blue
Red
Green
Spectral Sensitivity
W a v e l e n g t h ( n m )
0
1
1 0
1 0 0 0
Spectral Sensitivity
3 5 0
1 0 0
6 5 0 6 0 0 5 5 0 5 0 0 4 5 0 4 0 0 7 0 0
Blue
Red
Green