©Eastman Kodak Company, 1998
TECHNICAL DATA / BLACK AND WHITE FILM
February 1999
•
H-1-5231
================H-1-7276
EASTMAN PLUS-X
Negative Film 5231
™
/ 7231
™
DESCRIPTION
The speed and grain characteristics of EASTMAN PLUS-X
Negative Film 5231 (35 mm) and 7231 (16 mm) make it
well-suited for general motion picture production—both
outdoors and in the studio. These film characteristics provide
an excellent balance between the maximum desirable speed
for general production work and a fine-grain negative for
that speed. The speed of this panchromatic film permits the
use of small apertures, thus allowing good depth of field. The
film is also widely used for making composite projection
background scenes.
BASE
EASTMAN PLUS-X Negative Film has a gray acetate
safety base.
DARKROOM RECOMMENDATIONS
Handle unprocessed film in total darkness. If necessary, you
can use a safelight for a few seconds only after developing is
50 percent complete. Use a safelight equipped with a 15-watt
bulb and a KODAK Safelight Filter No. 3 / dark green. Keep
the safelight at least 4 feet (1.2 metres) from the film.
STORAGE
Store unexposed film at 13˚C (55˚F) or lower. Process
exposed film promptly. Store processed film at 21˚C (70˚F)
or lower at a relative humidity of 40 to 50 percent for normal
commercial storage. For more information on long-term
storage, see KODAK Publications No. H-1, KODAK Motion
Picture Film, and No. H-23, The Book of Film Care.
EXPOSURE INDEX/DIN
(For development to a gamma of 0.65 to 0.70.)
Daylight—80/20
Tungsten (3200 K)—64/19
Use these indexes with incident- or reflected-light exposure
meters and cameras marked for ISO or ASA speeds or
exposure indexes. These indexes apply for meter readings of
average subjects made from the camera position or for
readings made from a gray card of 18-percent reflectance
held close to and in front of the subject. For unusually light-
or dark-colored subjects, decrease or increase the exposure
indicated by the meter accordingly.
EXPOSURE TABLE FOR TUNGSTEN
LIGHT
At 24 frames per second (fps), 170˚ shutter opening:
FILTER FACTORS
RECIPROCITY
You do not need to make any filter corrections or exposure
adjustments for exposure times from 1/10,000 to 1/10
second. At an exposure time of 1 second, increase exposure
by
1
⁄
2
stop.
Lens Aperture
f
/1.4
f
/2
f
/2.8
f
/4
f
/5.6
f
/8
f
/11
Footcandles
required *
* At 18 fps, use
3
⁄
4
of the footcandles (fc) shown.
40
80
160
320
640
1250 2500
KODAK
WRATTEN
Filter No.
3
8
12
15
21
23a
25
29
96*
* For use in bright sunlight to reduce the exposure without modifying color
rendering or depth of field. This neutral density filter No. 96 with a density of
0.9 reduces the exposure.
Filter Factor
for Daylight
1.5
2.0
2.5
3.0
3.5
5.0
8.0 25
8.0
