User manual POLAROID T-85 DATASHEET

[. . . ] (weight) (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. 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. Format 31/4 x 33/8 in. [. . . ] 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. 4 1. 6 2 5. 6 12. 6 8 1 1 1 1/3 3 1/2 3 3 2 2. 5 2. 8 11. 2 8 8 Film Data Sheet Technical Data T-85 (positive/negative) Instant B&W Peel-Apart Pack 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. Filter Factors Reciprocity Law Failure 0. 5 100 0. 0 -0. 5 80 Modulation Transfer Function Spped Change (f-stops) % Modulation . 001" . 01" . 1" 1" 10" 100" -1. 0 -1. 5 -2. 0 -2. 5 -3. 0 60 40 20 -3. 5 0 1 2 3 4 Exposure Time (seconds) Spatial Frequency (cycles/mm) Spectral Sensitivity 1000 Spectral Sensitivity 100 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. (avdp) 10 1 0 350 450 550 650 750 Wavelength (nm) Warm Water Sodium sulfite (anhydrous) 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 85 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, 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. Thus, a correctly exposed positive may be accompanied by a negative that is too thin. To get the best possible negative at these temperatures, give more exposure, so that you get a positive that is somewhat lighter than normal. Temperature 65°F+ 18°C+ 60°F 15°C 50°F 10°C Processing time 30 sec. [. . . ] 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. Printing and retouching: When dry, the negative can be retouched, if necessary, and enlarged by conventional techniques. Coating and care of prints Prints must be coated immediately after development to protect them against scratching and fading. [. . . ]