2KODAK TRI-X AEROGRAPHIC Film 2403 KODAK TRI-X AEREC ON Film SO-050 • AS-24
EXPOSURE
Aerial film speeds (ISO A or EAFS) should not be confused
with conventional film speeds which are designed for roll
and sheet films used in pictorial photography. The
characteristics of aerial scenes differ markedly from those of
ordinary pictorial or ground scenes because of the smaller
range in subject luminances, atmospheric haze conditions,
and other factors. Therefore, different film-speed parameters
are used to relate aerial-scene characteristics to practical
exposure recommendations. The KODAK Aerial Exposure
Computer, KODAK Publication AS-10 has been published
based on the aerial film speed criterion.
Nominal speed, daylig ht (no filter ): EAF S or IS O A 500
Other suggested aerial film speeds for processing these
films in the KODAK VERSAMAT Film Processor, Models
11 or 1140, using VERSAMAT 885Chemicals,
641Chemicals, and Type A Chemicals can be found in the
sensitometric data tables.
Note: The aerial film speeds given in this publication were
obtained by rounding the calculated values to the nearest
cube root of 2 step (equivalent to 1⁄3 stop).

Filters

Typical Camera Exposure

A typical exposure for this film is approximately 1⁄400
second at f⁄8. This exposure is based on a solar altitude of 5
degrees, a clear day, an aircraft altitude of 5,000 feet, and a
speed of ISOA 640 (no filter).
When using an aerial camera equipped with an
antivignetting filter, or other filter, it is important to increase
this typical exposure by the filter factor of the filter used.

Reciprocity Characteristics

No exposure or development time adjustments are r equired
for exposure times from 1,000 second to 1⁄10 second. At
1⁄10,000 second, increase the development time by 10
percent.
KODAK PROFESSIONAL WRATTEN Gelatin Filter
No. 12 No. 25
Filter Factor 1.5 3
IMAGE STRUCTURE
The following data are based on processing in a KODAK
VERSAMAT Film Processor using KODAK VERSAMAT
Chemicals.
*
Granularity values read at a net diffuse density of 1.0 with a
48-micrometre aperture.
†
885--2 racks, 10 fpm, 85°F (29.5°C), process gamma 1.40
‡
641--2 racks, 6.5 fpm, 85°F (29.5°C), process gamma 1.25
§
Type A--2 racks, 10 fpm, 90°F (32°C), process gamma 1.70
885--1 rack, 15 fpm, 99°F (37°C), process gamma 0.95
STORAGE
For consistent results, all aerial films should be stored under
fairly constant conditions. Kodak aerial films are “usually”
packaged in equilibrium with 40 to 50 percent relative
humidity. High temperatures or high humidity ma y produce
undesirable changes in the film.

Unexposed Film

Store unexposed film in a refrigerator at 55°F (13°C) or
lower, or freezer at 0 to -10°F (-18 to -23°C), in the original
sealed container. If the film is stored in a refrigerator, remove
it about 2 hours before opening; if stored in a freezer, remove
it about 8 hours before opening. A sufficient warm-up time
is necessary to prevent moisture condensation on cold film—
otherwise, moisture spotting, ferrotyping, or sticking may
occur.

Exposed Film

Keep exposed film cool and dry. Process the film as soon as
possible after exposure to avoid undesirable changes in the
latent image. If it is necessary to hold exposed but
unprocessed film for several days (such as over a weekend),
it should be resealed and refrigerated at 40°F (4°C) or lower.
Before unsealing and processing exposed film that has been
held in cold storage, follow the warm-up procedures
described for unexposed film described above.

Processed Film

For best keeping, store processed film in a dark, dust-free
area at 50 to 70°F (10 to 21°C) and 30 to 50 percent relative
humidity. Preferably, store negatives on the spool or in
individual KODAK Sleeves. High relative humidity
promotes the growth of mold and causes ferrotyping. Very
low relative humidity causes excessive curl and brittleness.
Avoid storage temperatures over 80°F (27°C).
Resolving Power
(line pairs/mm) rms
Granularity
*
TOC 1.6:1 TOC 1000:1
VERSAMAT Model 11
885 Chemicals
†
40 100 40
641 Chemicals
‡
25 100 33
Type A Chemicals
§
32 80 55
VERSAMAT Model 1140
885 Chemicals
40 100 33