TECHNICAL DATA
/ COLOR NEGATIVE FILM
KODAK ROYAL GOLD 25 Film
December 1996 • E-40
E-40
November 1996
DESCRIPTION
KODAK ROYAL GOLD 25 Film has the same technically
advanced characteristics as the film it replaces—KODAK
EKTAR 25 Film. Like all ROYAL GOLD Films, it is
designed and produced to meet the needs of knowledgeable
and discriminating photographers who want more from
photographs than general-purpose films can provide.
ROYAL GOLD 25 Film offers micro-fine grain, extremely
high sharpness, and the capability for an extremely high
degree of enlargement. The film is designed for exposure
with daylight or electronic flash.
Use ROYAL GOLD 25 Film in cameras that allow you to
set the film speed manually, or in cameras that will correctly
set the film speed automatically from the DX code on the
magazine. (Some automatic 35 mm cameras do not read the
DX code for ISO 25/15˚ film and will underexpose it.) This
film requires more precise exposure control than generalpurpose films.
Other features include—
FEATURES
• Extremely high
sharpness
• Incorporates KODAK
T-GRAIN™ Emulsions
• Designed for
processing in KODAK
FLEXICOLOR
Chemicals for
Process C-41
• Built-in dye-masking
color couplers
• Enlargements of superb
• Micro-fine grain
• Can be processed with other
• Provides quality color
BENEFITS
clarity
ROYAL GOLD Films,
KODAK GOLD, EKTAR,
and EKTACOLOR Films,
KODAK Pro Films, and
KODAK VERICOLOR
and EKTAPRESS
Professional Films
reproduction without
supplementary masking
DARKROOM RECOMMENDATIONS
Do not use a safelight. Handle unprocessed film in total
darkness.
STORAGE AND HANDLING
Load and unload film in subdued light.
Store unexposed film at 70˚F (21˚C) or lower in the
original sealed package. Always store film (exposed or
unexposed) in a cool, dry place. Process film as soon as
possible after exposure.
Protect negatives from strong light, and store them in a
cool, dry place. For more information on storing negatives,
see KODAK Publication No. E-30, Storage and Care of
KODAK Photographic Materials—Before and After
Processing.
EXPOSURE
Film Speed
Use the speed numbers in the table below with cameras or
meters marked for ISO, ASA, or DIN speeds or exposure
indexes. Do not change the ISO-speed setting when metering
through a filter.
Light Source
Daylight or
Electronic Flash
Photolamp (3400 K) No. 80B 8/10˚
Tungsten (3200 K) No. 80A 6/9˚
* For best results without special printing.
KODAK WRATTEN
Gelatin Filter*
None 25/15˚
ISO Speed
©Eastman Kodak Company, 1996
Daylight
Use the exposures in the following table for average frontlit
subjects from 2 hours after sunrise to 2 hours before sunset.
Shutter
Lighting Conditions
Bright or Hazy Sun on
Light Sand or Snow
Bright or Hazy Sun (Distinct Shadows) 1/125
Weak, Hazy Sun (Soft Shadows) 1/125
Cloudy Bright (No Shadows) 1/60
Heavy Overcast or Open Shade† 1/60
* Usef/2.8 for backlit close-up subjects.
† Subject shaded from the sun but lighted by a large area of clear sky.
Speed
(second)
1/125
Lens
Opening
f
/8
f
/5.6*
f
/4
f
/4
f
/2.8
Electronic Flash
Use the guide number in the following table as a starting
point for your equipment. Select the unit output closest to the
number given by your flash manufacturer. Then find the
guide number for feet or metres.
To determine the lens opening, divide the guide number
by the flash-to-subject distance. If negatives are consistently
too dense (overexposed), use a higher guide number; if they
are too thin (underexposed), use a lower number.
Unit Output
(BCPS)*
350
500 24/7
700 30/9
1000 35/11
1400 40/12
2000 50/15
2800 60/18
4000 70/21
5600 85/26
8000 100/30
* BCPS = beam candlepower seconds
Guide Number
For Distances in Feet/Metres
20/6
PROCESSING
Process KODAK ROYAL GOLD 25 Film in KODAK
FLEXICOLOR Chemicals for Process C-41. For more
information, see KODAK Publication No. Z-131, Using
KODAK FLEXICOLOR Chemicals.
IMAGE STRUCTURE
Sharpness: Extremely High
Degree of Enlargement: Extremely High
Print Grain Index: Less than 25
Print Grain Index
The Print Grain Index number refers to a method of defining
graininess in a print made with diffuse-printing illumination.
It replaces rms granularity and has a different scale which
cannot be compared to rms granularity.
• This method uses a uniform perceptual scale, with a
change of four units equaling a just noticeable difference
in graininess to 90 percent of observers..
• A Print Grain Index rating of 25 on the scale represents the
approximate visual threshold for graininess. A higher
number indicates an increase in the amount of graininess
observed.
• The standardized inspection (print-to-viewer) distance for
all print sizes is 14 inches, the typical viewing distance for
a 4 x 6-inch print.
• In practice, larger prints will likely be viewed from
distances greater than 14 inches, which reduces apparent
graininess.
• Print Grain Index numbers may not represent graininess
observed from more specular printing illuminants, such as
condenser enlargers.
The Print Grain Index number printed in this publication
applies to the following standards:
Negative size: 24 x 36 mm
(135 size)
Print size: 4 x 6 inches
Magnification: 4.4X
Adjustments for Long and Short Exposures
No filter correction or exposure compensation is required for
exposures from 1/10,000 second to 100 seconds. We do not
recommend exposures longer than 100 seconds.
2 KODAK ROYAL GOLD 25 Film • E-40
CURVES
4.0
3.0
2.0
DENSITY
1.0
0.0
2.0
F002_0539AC
Characteristic Curves
Exposure:
Process:
Densitometry:
Daylight 1/100 second
C-41
Status M
1.0
LOG EXPOSURE (lux-seconds)
2.0
Magenta-
Forming
Layer
Spectral-Sensitivity Curves
1.0
*
0.0
Yellow-
Forming
Layer
Cyan-
Forming
Layer
B
G
0.0
R
1.0 2.0
LOG SENSITIVITY
Effective Exposure:
1.0
Process:
Densitometry:
Density:
2.0
300250
*Sensitivity = reciprocal of exposure (ergs/cm ) required
F002_0540AC
1/50 second
C-41
Status M
0.2 above D-min
WAVELENGTH (nm)
to produce specified density
550
600 650450 500400350
2
750700
Spectral-Dye-Density Curves
2.5
Typical densities for a midscale neutral subject
and D-min.
Process:
2.0
C-41
1.5
1.0
Midscale Neutral
Minimum Density
DIFFUSE SPECTRAL DENSITY
0.5
0.0
400
F002_0541AC
500
WAVELENGTH (nm)
600
700
NOTICE: The sensitometric curves and data in this publication represent product tested
under the conditions of exposure and processing specified. They are representative of
production coatings, and therefore do not apply directly to a particular box or roll of
photographic material. They do not represent standards or specifications that must be
met by Eastman Kodak Company. The company reserves the right to change and
improve product characteristics at any time.
KODAK ROYAL GOLD 25 Film • E-40 3
KODAK ROYAL GOLD 25 Film
JUDGING NEGATIVE EXPOSURE
You can check the exposure level with a suitable electronic
densitometer equipped with a filter such as a KODAK
WRATTEN Gelatin Filter No. 92 or the red filter for
Status M densitometry. Depending on the subject and the
light source used for exposure, a normally exposed and
processed color negative measured through the red filter
should have the approximate densities listed below.
Area Measured
KODAK Gray Card
The
the same illumination as the subject
The lightest step (darkest in negative) of a
KODAK Paper Gray Scale
same illumination as the subject
The highest diffuse density on a normally
lighted forehead
—light complexion
—dark complexion
(gray side), receiving
receiving the
Density
Reading
0.75 to 0.95
1.10 to 1.30
1.00 to 1.30
0.85 to 1.20
Because of the extreme range in skin color, use these red
density values for a normally lighted forehead only as a
guide. For best results, use a KODAK Gray Card (gray side).
PRINTING NEGATIVES
You can make color prints from negatives by enlarging them
on KODAK EKTACOLOR Papers or KODAK
DURAFLEX® RA Print Material.
Make color transparencies by direct exposure onto
KODAK VERICOLOR Print Film, KODAK VERICOLOR
Slide Film, or KODAK DURATRANS® RA or KODAK
DURACLEAR™ RA Display Material.
Make black-and-white prints on KODAK PANALURE
Papers for conventional black-and-white processing, or
KODAK EKTAMAX RA Professional Papers for
Process RA-4.
MORE INFORMATION
Kodak has many publications to assist you with information
on Kodak products, equipment, and methods. The following
publications are available from dealers who sell Kodak
products, or you can order them directly from Kodak through
the order form in KODAK Publication No. L-1, KODAK
Index to Photographic Information. To obtain a copy of L-1,
send your request with $1 to Eastman Kodak Company,
Department 412-L, Rochester, New York 14650-0532.
E-30
E-41
E-42
E-43
E-44
Z-131
Note: The Kodak materials described in this publication for
use with KODAK ROYAL GOLD 25 Film are available
from dealers who supply Kodak products. You can use other
materials, but you may not obtain similar results.
Storage and Care of KODAK Photographic
Materials—Before and After Processing
KODAK ROYAL GOLD 100 Film
KODAK ROYAL GOLD 200 Film
KODAK ROYAL GOLD 400 Film
KODAK ROYAL GOLD 1000 Film
Using KODAK FLEXICOLOR Chemicals
Kodak Information Center’s
Faxback System
—Available 24 hours a day, 7 days a week—
Many technical support publications for Kodak
products can be sent to your fax machine
from the Kodak Information Center. Call:
U.S.A.1-800-242-2424, Ext. 33
Canada 1-800-295-5531
If you have questions about Kodak products, call Kodak.
In the U.S.A.:
1-800-242-2424, Monday–Friday
8 a.m.–8 p.m. (Eastern time)
In Canada:
1-800-465-6325, Monday–Friday
8 a.m.–5 p.m. (Eastern time)
Or contact Kodak on-line at:
http://www.kodak.com/
KODAK ROYAL GOLD 25 Film
KODAK Publication No. E-40
CAT 883 2289
This publication is printed on recycled paper that contains
50 percent recycled fiber and 10 percent post-consumer material.
Consumer Imaging
EASTMAN KODAK COMPANY • ROCHESTER, NY 14650
Kodak, T-Grain, Flexicolor, Vericolor, Ektapress, Gold, Royal Gold,
Ektar, Wratten, Ektacolor, Duraflex, Duratrans, Duraclear, Panalure, and
Ektamax are trademarks.
Minor Revision 12-96
Printed in U.S.A.
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