SPECIFIC APPLICATIONS
Pictorial Photography
These films produce high-quality pictorial negatives when processed in KODAK TECHNIDOL Liquid Developer. (See “PROCESSING.”) Conventional developers generally produce contrast too high for normal pictorial photography. Process the film according to the instructions for KODAK TECHNIDOL Liquid Developer.
In pictorial applications, the fine grain permits enlargements at magnifications of 25X or more with little perceptible grain. The extended red sensitivity has a haze-cutting effect in photographs of distant landscapes and in aerial shots.
Use an exposure index of 25 for trial exposures.
Copy Applications
You can use these films for copying printed material, making reverse-text title slides, and copying continuous-tone photographs.
Use two lamps. Place one on each side of the copy material so that each light strikes the material at about a
45-degree angle. For originals larger than 16 x 20 inches (40 x 50 cm), you may need four lamps (two on each side) for uniform illumination. Determine the exposure with a meter.
If you use a camera with a through-the-lens meter, take the reading from a gray card in the copy position. The meter could give you an incorrect reading from the copy itself, depending on the amount of text.
If you do not use an exposure meter, try these starting points: With two No. 2 photolamps in matte-surface reflectors at about 4 feet (1.2 metres) from the copyboard, use 1/60 second at ƒ/8. With two No. 1 photolamps, increase the exposure by one stop.
With meters marked for ISO (ASA/DIN) speeds or exposure indexes, use these film-speed values:
Starting-Point Exposures for Copying Printed
Materials: With meters marked for ISO (ASA/DIN) speeds or exposure indexes, use these film-speed values:
•Tungsten 320/26°—for incident-light readings or for reflected-light readings from a gray card (18-percent reflectance) at the copyboard.
•Tungsten 64/19°—for reflected-light readings from a matte white card (90-percent reflectance) at the copyboard.
Note: These values are based on small-tank development in KODAK Developer D-19 for 4 minutes at 68°F (20°C) with agitation at 30-second intervals.
The exposure index is based on the formula EI = 36/H, where H is the 1-second exposure in lux-seconds required to produce a density of 1.20 above minimum density with the indicated development.
Starting-Point Exposures for Making Reverse-Text
Slides: With exposure meters marked for ISO (ASA/DIN) speeds or exposure indexes, use these film-speed values:
•Tungsten 200/24°—for incident-light readings or for reflected-light readings from a gray card (18-percent reflectance) at the copyboard.
•Tungsten 40/17°—for reflected-light readings from a matte white card (90-percent reflectance) at the copyboard.
Note: These values for reverse-text slides are based on development in KODAK DEKTOL Developer for 3 minutes at 68°F (20°C).
The exposure index is based on the formula EI = 10/H, where H is the 1-second exposure in lux-seconds required to produce a density of 0.60 above minimum density with the indicated development.
Copying Continuous-Tone Photographs: To copy continuous-tone photographs, use an exposure-index value to achieve a gamma value between 0.6 and 1.0, depending on the contrast of the original. For low-contrast originals, you can try KODAK HC-110 Developer (Dilution B) for
6minutes (EI 160); for higher-contrast originals, use KODAK TECHNIDOL Liquid Developer for 9 minutes (EI 25).
Microphotography (Microfilming)
The resolving power of Technical Pan Film allows microfilming of most documents at reductions of up to 20X, assuming that the copying lens is of high quality and is carefully focused. The film plane and the plane of the copyboard must be parallel to provide sharp focus over the whole image area. When you photograph black-and-white originals, use a green filter such as a KODAK WRATTEN Gelatin Filter No. 58 or 61. This will help suppress the chromatic aberrations found in most lenses that would be emphasized by the extended red sensitivity of the film.
For optimum image quality, adjust the exposure to achieve a negative density of 1.20 in the areas that correspond to the white or light-colored areas of the original. Process the film to a gamma of 2.0 in KODAK HC-110 Developer (Dilution D) for 8 minutes at 68° F (20°C)
(EI 125).
Photographing Electrophoretic Gels
Electrophoretic gels are often photographed to produce prints for information storage, analysis, display, and publication. KODAK PROFESSIONAL Technical Pan Films yield high-quality black-and-white negatives from which you can make high-quality prints of these gels. Adjust exposure carefully to minimize the appearance of the gel background tint in the prints.
Make tests to determine exposures for your lighting conditions. Develop the film for 4 minutes in KODAK HC-110 Developer (Dilution D) at 68°F (20°C) (EI 80). TECHNIDOL Liquid Developer may also work with your setup.
