Polaroid T-51HC User Manual

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.
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.
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