Features and Applications:
Konica Infrared 750 Black & White Film is suitable both for ordinary
infrared photography and for specialized or scientific applications using
infrared radiation. Its fine grain and high resolution make this film suitable
for use without filters, as well, for ordinary black and white photographs in
cases where very faithful reproduction of gray tones is desired.
In infrared photography, it is effective in creating spectacular scenes and special effects; portraying greens and clouds as pure white and blue sky and water as coal black. Warm skin tones and lips will appear white.
Usage for scientific applications include: Document identification; medical imaging; biological photography; archeological surveying; mapping; and aerial photography.
Layer Composition:
A single thin infrared-sensitive emulsion layer is coated on a colored
anti-halation triacetate bas. The emulsion is fine grain with excellent
resolving power.
Handling of Film:
Avoid direct sunlight or other strong light when loading or unloading
camera.
Infrared Focusing:
Due to the smaller refractive index of infrared radiation, infrared rays do
not converge on the same focal plane as viable light rays. If the lens used is
equipped with an infrared correction mark (R mark), focus as usual and then
shift the distance scale of the lens' focusing ring to the infrared
correction mark.
Note: Some aprocromatic lenses may not require compensation for focusing.
Filtration: Konica Infrared 750 film has a wavelength sensitivity range of 640nm to 820nm in addition to the intrinsic sensitivity of the silver bromide of 400nm to 500nm. The peak sensitivity occurs at 750nm. Without filtration, images obtained are similar to those taken with panchromatic films. In order to emphasize the infrared sensitivity, it is necessary to use either a red (Kenko R-1) or orange (Kenko YA3) filters over the lens to sharply cut the wavelengths below 520nm or 640nm. Other red (i.e. Wratten 25, Wratten 29) and orange (Wratten 15) will offer similar results.
Exposure Conditions:
The standard exposure conditions for Konica Infrared 750 film are as
follows: With a Kenko R-1 filter, the standard exposure conditions are f5.6
@1/60 second (bright sun, outdoors).
With no filter the speed of the film is equivalent to ISO 32. Light meters and
the human eye are not sensitive to infrared radiation. Scenes that contain
equivalent amounts of white light may not emit equivalent amounts of infrared.
The suggested exposure conditions above will yield a usable image, however, to
optimize the exposure, trail exposures should be made. Keep in mind that the
shadow areas in a scene will have very low amounts of infrared rays, even in
the daytime, therefor to avoid underexposure, the lens aperture can be opened
one additional stop.
Darkroom Illumination:
Konica Infrared 750 film should be handled in complete darkness.
Processing Conditions:
Developer:
The same developers that are used for processing panchromatic films can be
used with Konica Infrared 750 film. Final contrast of the film can be adjusted
by changing the standard development time. A Small tank can be used to process
the film. The following table illustrates the standard development times for
different developers. When processing, it is important to agitate continuously
for the first minute and then for 5 seconds at one minute intervals until the
development step is completed.
| DEVELOPER | TIME (25°C) |
|---|---|
| D-76 | 6 |
| DK-20 | 7 |
| ID-68 | 6 |
Stopbath:
Use a 1½% acetic acid solution of stopbath. Immerse film in the
stopbath for 30 seconds with the temperature about the same as that of the
developer.
Fix:
Use the Konica fixers or equivalents described in the following table. The
fixer temperature should be about the same as the developer temperature.
During the fixing step, agitate the film for 5 seconds at one minute intervals.
| FIXER | TIME |
|---|---|
| Konica Fixer (acid hardening) | 10 min. |
| Konica fix rapid (acid hardening) | 3 min. |
Wash: Wash film in running water @75°F/25°C for 20-30 minutes. To reduce water wash time, dip the film into a 2% anhydride sodium sulfite solution for 2-3 minutes after fixing. Place under running water with agitation for 5 minutes.
Dry: After washing, dip the film into a ½ solution of wetting agent for 1 minute. Hang the film in a well-ventilated and dust free location. If a wetting agent is not available, gently squeegee the water off the surface of the film with a sponge.
Film Storage Conditions: For best results, process before expiration date stamped on package. Store unexposed film in a cool, dark place with low humidity. Do not leave the film loaded in a camera for a long time.
Revised: May 30, 2001