User manual POLAROID T-55 DATASHEET

[. . . ] 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. (9 x 11. 4 cm) Finish Glossy Exposures per Unit 20 exposures per box Development Time 20-25 seconds at 700F 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. [. . . ] 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. 1 0 -3 -2 -1 Relative Lo g Exposure 0 Film Data Sheet Technical Data T-55 (Positive/negative) 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. Modulation Transfer Function 100 Reciprocity Law Failure 0. 5 0. 0 -0. 5 -1. 0 -1. 5 -2. 0 -2. 5 80 Speed Change (f-stops ) % Modulation 60 40 20 0 -3. 0 -3. 5 . 001" . 01" . 1" 1" 10" 100" 1 2 3 4 Spatial Frequency (cycles/mm) Exposure Time (seconds) Processing the reusable negative In order to remove the reagent layer and the anti-halation 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 (anhydrous) Metric 2. 0 liters 440 grams U. S. (avdp) 400 500 600 Spectral Sensitivity 1000 100 Spectral Sensitivity 10 1 0 350 400 450 500 550 600 650 700 Wavelength (nm) Speed variation relative to color temperature Filter Factors Filter no. Light source at 3200o K - Tungsten Aperture adjustment (f-stops) Filter factor (exposure multiplier) Light source at 5500o K - Daylight Aperture adjustment (f-stops) Filter factor (exposure multiplier) 6 1/3 8 2/3 15 1 25 2 1/3 47 4 58 3 3200oK -1/3 stop 4800oK - 5500oK 50 6500oK - 7500oK - 10, 000oK -1/3 stop 1. 3 1. 6 2 6. 3 16 8 2/3 1 1 1/3 3 1/2 3 3 1. 6 2 2. 5 11. 2 8 8 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. Type 55 Polaroid Positive/Negative Black & White Instant Pack Film First prepare the negative-clearing solution Do this before the film is exposed and developed. Immediately after development (within 3 minutes) the negative must be immersed in an 18% sodium sulfite clearing bath. Preparation of the 18% sodium sulfite solution Sodium sulfite powder is readily available from professional photographic supply dealers and chemical supply houses. (avdp. ) (anhydrous/desiccated) Slowly add the powder to the water; stir continuously until all powder is dissolved. Store the solution in brown, well-stoppered bottles or in a tank with a floating lid. Loading, exposing and processing film See instructions supplied with your camera or film holder for detailed information. Important: For best results in the minimum density areas of the negative, separating the negative and preparing it for printing should be done in dim light. (Such extended development will improve the minimum density areas of the negative and assist in negative clearing, but may reduce the quality of the accompaning Polaroid print. ) Separating the negative and print: At the end of the full recommended development time, peel the print away from the negative using a swift unhesitating motion. Be careful not to touch or scratch the image surface of the negative or the print. Coat the print immediately (see Coating and care of prints. ) Temperature is important Pictures may be exposed at any temperature, but the temperature of the film during development is important. [. . . ] As soon as you can do so, treat the negatives in a sodium sulfite bath in the normal way. Avoid scratching the negatives, by keeping them away from each other and from the sides of the container. Dip negative in wetting agent: To avoid drying marks, use a wetting agent (such as Kodak Photo-Flo diluted at least 1:600). Dry negative: Hang up with commercially available film clips, hangers, clothespins, etc. [. . . ]