Page 1
Film Data Sheet
T-51HC
4 x 5 Black & White Sheet Film
Description
High-contrast, 4 x 5 positive and negative sheet film for detailed
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10.2 x 12.7 cm
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black & white prints.
Key Applications
• Copystand photography
• Fingerprint documentation
• Graphic arts
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Film Speed
ISO 640/DIN 29 (Positive/daylight)
ISO 400/DIN 27 (Positive/tungsten)
ISO 80/DIN 20 (Negative/daylight)
ISO 50/DIN 18 (Negative/tungsten)
Format
4 x 5 in.
(10.2 x 12.7 cm)
Sheet Film
Image Area
31/2 x 41/2 in.
(9 x 11.4 cm)
Finish
Glossy
Exposures per Unit
20 exposures per box
Development Time
30 seconds at 700F
Compatible Hardware
• Any camera or instrument equipped with a Model 545/545i
Film Holder
• MP-4+ camera
Special Treatment
Requires print coating the positive and clearing the negative. To
clear the negative for reuse, immerse it in a sodium sulfite
clearing bath immediately after development. Sodium sulfite
powder is readily available from professional photographic supply
dealers and chemical supply houses.
Mix in the following proportions:
Warm water: 2 liter or 70 fl. oz.
Sodium sulfite Powder: 440 grams or 16 oz. (weight)
(anhydrous/desiccated)
Slowly add the powder to the water; stir continuously until all
powder is dissolved. Allow to cool to approximately 700F(210C)
before using. Store the solution in brown, well-stoppered
bottles or in a tank with a floating lid.
To prevent scratches:
Negative scratch resistance can be improved by treating the
processed negative (after clearing in water and sodium sulfite)
in a solution of Kodak Rapid Fix with Hardener (parts A & B)
for two minutes. This solution should be made up and used in
accordance with Kodak’s recommended mix procedures,
chemical caution statements, wash times and temperatures.
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.
All other product names may be the property of their respective owners.
Page 2
Film Data Sheet
Technical Data
T-51HC High Contrast (4x5 sheet)
Instant B&W Peel-Apart Film (HDC)
This information represents the typical performance of Polaroid T-51HC film. Specific film lots may vary .
Recommended
speed (ISO)
Recommended
processing tim e at
o
F/21oC
70
Spectral sen sitivity
Resolution (1000:1)
Contrast
Print: 640/29
Neg.: 80/20
Print: 20 - 30 line pairs/mm
Neg.: 100 - 120 line pairs/mm
o @
o @
55000K
30 se conds
Panchromatic
Print: High
Neg.: Medium
55000K
Processing time and temperature
For best results process at temperatures
above 60oF(16oC).
o
F
70-95 21-35 30 None
65 18 35 None
55 13 50 None
Time in
o
C
seconds
Exposure
Adjustment
Effect of over/under development
Beyond compensating for the effects of
high and low temperatures, this film can
be over or under developed for positive
contrast modulation. Over development
produces higher contrast and lower
densities in the positive. Under
development results in lower contrast.
Neither over nor under development has
any significant effect on the negative
contrast. Under development can result in
an increase in negative D-Min.
Characteristic H&D curve for
normal, hot and cold development
3.0
55oF/13oC
2.5
2.0
1.5
Sample Density
1.0
0.5
0.0
-3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0
Relative Log Exposure
70
85oF/29oC
o
F/21oC
Characteristic H&D curve for normal,
3.0
2.5
2.0
1.5
Sample Density
1.0
0.5
0.0
under and over development
Positive
-3.0
-2.5 -2.0 -1.5 -1.0 -0.5 0.0
Relative Log Exposure
25 seconds
30 seconds
120 seconds
Negative
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.
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.
Page 3
Film Data Sheet
Technical Data
T-51HC High Contrast (4x5 sheet)
Instant B&W Peel-Apart Film (HDC)
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.
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
Speed Change (f-stops)
-3.5
0.001 0.01 0.1 1 10 100
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.
Reciprocity Law Failure
Exposure Time (seconds)
Processing the reusable negative
In order to remove the reagent layer and the antihalation dyes, the processed negative needs to be
washed in an 18% sodium sulfite solution. The salts
within the solution minimize swelling in the
negative’s gelatin layer that would be caused by
washing in water only. Swelling can cause
reticulation which would remain after the negative
dries.
To prevent scratches:
Negative scratch resistance can be improved by
treating the processed negative (after clearing in
water and sodium sulfite) in a solution of Kodak
Rapid Fix with Hardener (parts A & B) for two
minutes. This solution should be made up and
used in accordance with Kodak’s recommended
mix procedures, chemical caution statements,
wash times and temperatures.
Ingredients
Warm Water
Sodium sulfite
Metric
2.0 liters
440 grams
U.S.
70 fl. oz.
16 oz. (avdp)
(anhydrous)
1000
Spectral Sensitivity
100
10
1
Spectral Sensitivity
0
350 400 450 500 550 600 650 700 750
Wavelength (nm)
Modulation Transfer Function
100
80
60
40
% Modulation
20
0
0.1 0.25 1 2.5 4
Spatial Frequency (cycles/mm)
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