Description, Exposure INDEX/DIN, Base

TECHNICAL DATA / BLACK AND WHITE FILM

February 1999 · H-1-5231

EASTMAN PLUS-X Negative Film 5231™ / 7231™

================H-1-7276

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.

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.

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 TABLE FOR TUNGSTEN LIGHT

At 24 frames per second (fps), 170˚ shutter opening:

Lens Aperture	f/1.4	f/2	f/2.8	f/4	f/5.6	f/8	f/11

Footcandles	40	80	160	320	640	1250	2500
required *	40	80	160	320	640	1250	2500
required *

* At 18 fps, use 3¤4 of the footcandles (fc) shown.

FILTER FACTORS

KODAK	3	8	12	15	21	23a	25	29	96*
WRATTEN	3	8	12	15	21	23a	25	29	96*
Filter No.

Filter Factor	1.5	2.0	2.5	3.0	3.5	5.0	8.0	25	8.0
for Daylight	1.5	2.0	2.5	3.0	3.5	5.0	8.0	25	8.0
for Daylight

*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.

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.