Page 1
Film Data Sheet
Polapan 400 (T-572)
Black & White 4 x 5 Pack Film
Description
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A panchromatic, medium-contrast film producing fine grain
prints with excellent gradation and tonal range.
Key Applications
• Professional photography proofing
• Test shots of less than
• Scientific imaging (strobe or shorter exposures)
1
/10 second or with strobe
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Film Speed
ISO 400/DIN 27
Format
4 x 5 in. (9 x 12 cm)
Pack Film
Image Area
1
3
/2 x 45/8 in.
Finish
Glossy
Exposures per Unit
10 exposures per box
Development Time
45 seconds at 70°F
Compatible Hardware
• Any instrument or camera equipped with a Model 550
ILOP
Film Holder
• MP-4+ Camera
Special Treatment
Processing the film for longer than 3 minutes may affect image
contrast and density to some extent. For optimum image stability
at temperatures above 75°F (24°C), film should not be processed
for longer than one (1) minute. At colder temperatures, process
the film for a longer time as indicated in the chart below. A picture
processed for too short a time will have dull grays, mottle and little
contrast. However, if more contrast is required, the processing
time may be extended by 15 seconds (for example, process for 70
seconds rather than 55 seconds). This may increase the contrast
and density, but may also result in some loss of gray.
Reciprocity Performance
Indicated Effective Exposure
Exposure (sec.) Film Speed (ISO) Adjustment
< 1 /15 400/27 None
1 250/25 +
4 200/24 +1 f/stop
16 125/22 +1
64 80/20 +2
128 64/19 +2
2
/3 f/stop
2
/3 f/stop
1
/3 f/stop
2
/3 f/stop
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” and “Polapan” are trademarks of Polaroid Corporation, Cambridge, MA 02139 USA.
Page 2
Film Data Sheet
Technical Data
Polapan 400 (black & white peel-apart)
T-72 (4x5 sheet), T-572 (4x5 pack) and T-672 (pack)
The information below represents the typical performance of Polaroid’s Polapan 400 black and white films.
Specific film lots may vary .
o
Recommended
speed (ISO)
Recommended
processing time
and temperature
Spectral
sensitivity
Resolution
(1000:1)
Contrast
400/27
55 seconds at
o
70
F/21oC
Panchromatic
20 - 22 line
pairs/mm
Medium
Characteristic H&D curve for normal,
hot and cold development
3
550F/180C
0
F/210C
70
0
F/350C
95
2
Processing time and temperature
For best results process at temperatures
above 60oF(16oC).
o
FoC
Time in
seconds
Exposure
Adjustment
95 35 30 -2/3 stop
85 29 30 -1/3 stop
75 24 30 None
70 21 45 None
65 18 60 None
55 13 90 1/3 stop
Characteristic curve for normal,
under and over development
3
H&D Curves
o
@ 70
F/21oC
2
1
Sample Density
0
-3
Relative Log Exposure
30 sec.
45 sec.
180 sec.
Sample Density
1
0
-3
-2 -1
0
Relative Log Exposure
At 71o F/21o C: D-Max = 1.70 D-Min = .10 Slope = 1.65
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.
0-2 -1
Page 3
Film Data Sheet
Technical Data
Polapan 400 (black & white peel-apart)
T-72 (4x5 sheet), T-572 (4x5 pack) and T-672 (pack)
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.
Filter Factors
Reciprocity Law Failure
0.5
0
-0.5
-1
-1.5
-2
-2.5
Speed Change (f-stops)
-3
-3.5
0.001 0.01 0.1 1 10 100
Exposure Time (seconds)
Modulation Transfer Function
100
80
Light source at
o
3200
K - Tungsten
Light source at
o
5500
K - Daylight
1000
100
Filter no. 6 8 15 25 47 58
Aperture
adjustment
(f-stops)
Filter factor
(exposure
multiplier)
Aperture
adjustment
(f-stops)
Filter factor
(exposure
multiplier)
1/3 1/2 2/3 1 1/2 3 1/2 3 1/2
1.3 1.4 1.6 2.8 11.2 11.2
2/3 1 1 1/3 2 1/2 2 2/3 3 1/3
1.6 2 2.5 5.6 6.3 10
Spectral Sensitivity
10
60
40
20
Spatial Frequency (cycles/mm)
0
1423
Spatial Frequency (cycles/mm)
Speed variation relative to color temperature
3200oK 4800oK 5500oK 6500oK 7500oK 10,000oK
-1/3 stop - - - +1/3 stop +1/3 stop
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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