Film Data Sheet
T-56
4 x 5 Sepia Sheet Film
Professional B&W Sheet Film
4 x 5 Inch
9 x 12 cm
Film Speed
ISO 400/DIN 27
Format
4 x 5 in. (10.16 x 12.7 cm)
Sheet Film
Image Area
1
3
/2 x 41/2 in. (9 x 11.4 cm)
Description
A panchromatic, medium-contrast film producing sepia-tone
prints with excellent gradation and tonal range.
Key Applications
• Old time photography
• Professional photography
Compatible Hardware
• Any instrument or camera equipped with a Model 545/545i
Film Holder
• MP-4+ Camera
Special Treatment
The processing temperature affects the tone of the print. Prints
processed in cold temperatures are more brown tone and in hot
temperatures more yellow tone. Processing for longer than
recommended may cause a “guilding” effect (a metallic sheen in
the dark areas of the print, giving it a daguerrotype appearance).
Over-processing may cause print curl.
Finish
Glossy
Exposures per Unit
20 exposures per box
Development Time
45 seconds at 70°F
Caution
This film uses a small amount of caustic paste. If any paste appears, avoid contact with skin, eyes and mouth
and keep away from children and animals. If you get some paste on your skin, wipe it off immediately, then
wash with water to avoid an alkali burn. If eye contact occurs, quickly wash the area with plenty of water and
see a doctor. Keep discarded materials away from children, animals, clothing and furniture.
Limited Warranty
See information on the film box.
“Polaroid” is a registered trademark of Polaroid Corporation, Waltham, MA 02451 USA.
Film Data Sheet
Technical Data
T-56 Sepia
Instant B&W Peel-Apart Film
The information below represents the typical performance of Polaroid T-56 Sepia black and white peel-apart film.
Specific film lots may vary.
o
Recommended
speed (ISO)
Recommended
processing time
and temperature
Resolut ion (10 00:1) 14 - 20 line pairs/mm
Contrast Medium
Spectral sensitivity Panchromatic
400/27
45 sec. at 70
o
F/21oC
Processing time and temperature
For best results process at temperatures
above 60oF(16oC).
o
F
o
C
Time in
seconds
95 35 30
85 29 30
75 24 35
70 21 45
65 18 45
55 13 50
3
2
Sample Density
1
Characteristic H&D curve for normal,
hot and cold development
550F/130C
0
F/210C
70
0
F/350C
95
CRT Exposure Index*
0.5 Density**
Phosphor
P-4
P-11
P-16
P-24
P-31
* Value measured in reciprocal ergs/cm2 to
obtain desired density. Exposure duration is
1/125 second.
** 0.5 density intercept is comparable to the
0.6 net density given for most conventional
negative films.
Intercept
93
113
174
82
76
0
-3
Characteristic H&D curve for normal,
under and over development
3
30 sec.
45 sec.
60 sec.
-1-3 -0
2
Sample Density
1
0
H&D Curves
o
@ 70
F/21oC
-2
Relative Log Exposure
-2 -1
Relative Log Exposure
D-Max:
The density value for the film’s
darkest black.
D-Min:
The lowest density value that a film
exhibits. In prints, the whiteness of the
brightest highlight, relative to the
unprocessed print.
Slope:
The positive ratio of the log E
increments of the straight line region of the
curve, as determined by the 1/4-3/4
increment method. The slope of an H&D
curve indicates the overall contrast of a
film: low contrast slopes less than 1.10;
medium contrast slopes from 1.10 to 1.70;
high contrast slopes greater than 1.70.
0
Film Data Sheet
y
Technical Data
T-56 Sepia
Instant B&W Peel-Apart Film
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.
Reciprocity Law Failure
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
Speed Change (f-stops)
-3.0
-3.5
.001" .01" .1" 10" 100"
Exposure Time (seconds)
Speed variation relative to color temperature
3200oK4800oK5500oK6500oK7500oK10,000oK
-1/3 stop - 3000 - - +1/3 stop
Filter Factors
Filter no. 6 8 15 25 47 58
Light source at
o
K - Tungsten
3200
Light source at
o
K - Daylight
5500
Aperture
adjustment
(f-stops)
Filter factor
(exposure
multiplier)
Aperture
adjustment
(f-stops)
Filter factor
(exposure
multiplier)
1"
1/3 2/3 1 1/3 2 3 3
1.3 1.6 2.5 4 8 8
1 1 1/3 1 2/3 3 2 1/2 3 1/3
2 2.5 3.2 8 5.6 10
Modulation Transfer Function
100
80
60
40
% Modulation
20
0
134
2
Spatial Frequency (cycles/mm)
Spectral Sensitivit
1000
100
10
Spectral Sensitivity (cm^2/erg)
1
350 450 550 650 750
Wavelength (nm)
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.
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