Electronic flash, Calculating the correct aperture, Multiple exposure with electronic flash – Kodak Ektachrome E100 Color Transparency Film (35mm Roll Film, 36 Exposures) User Manual

Page 2: Adjustments for long and short exposures, Fluorescent and high-intensity discharge lamps

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KODAK PROFESSIONAL EKTACHROME Film E100

E-4000

Electronic Flash

Use the appropriate guide number in the table below as a
starting point for your equipment. First select the unit
output closest to the number given by your flash
manufacturer, then find the guide number in either English
or Metric units.

Calculating the Correct Aperture

To determine the recommended lens aperture (f/ number),
divide the guide number by the flash-to-subject distance.
That is, f/# = GN / Subject Distance. For example, if
measuring in English units the flash has a Guide Number of
100, and the flash to subject distance is 9 feet, the
recommended aperture setting is: f# = 100 feet / 9 feet =
11. In metric units, this would be: f/# = 30 metres /
2.75metres = 11. If transparencies are consistently too thin
(overexposed), use a higher guide number; if they are too
dense (underexposed), use a lower number.

BCPS = beam candlepower seconds

Multiple Exposure with Electronic Flash

No filter corrections or exposure adjustments are required
for the effects of multiple, consecutive flashes (multipops)
up to 4 flashes. For 8 flashes, add CC05M filtration.

Adjustments for Long and Short Exposures

No filter correction or exposure compensation is required
for exposure times from 1/10,000 to 10 seconds. At
exposure times of 120 seconds, add CC10R filtration.

Note:

This information applies only when the films are

exposed to daylight. The data are based on average
emulsions rounded to the nearest 1/3 stop and assume
normal, recommended processing. Use the data only as a
guide. For critical applications, make tests under your
conditions.

Unit Output (BCPS)

Guide Number

English Units

(feet)

Metric Units

(metres)

350

40

12

500

50

15

700

60

18

1000

70

21

1400

85

26

2000

100

30

2800

120

36

4000

140

42

5600

170

50

8000

200

60

Fluorescent and High-Intensity Discharge Lamps

Use the color-compensating filters and exposure
adjustments below as starting points to expose these films
under fluorescent or high-intensity discharge lamps. For
critical applications, make a series of test exposures under
your actual conditions.

To avoid the brightness and color variations that occur

during a single alternating-current cycle, use exposure
times of 1/60 second or longer with fluorescent lamps;
with high-intensity discharge lamps, use exposure times of
1/125 second or longer.

When the type of fluorescent lamp is unknown, try this

filter and exposure adjustment; color rendition may be less
than optimum.

This is a high-pressure sodium-vapor lamp. The

information in the table may not apply to other
manufacturers’ high-pressure sodium-vapor lamps due to
differences in spectral characteristics.

Note:

Consult the manufacturer of high-intensity lamps for

ozone ventilation requirements and safety information on
ultraviolet radiation.

Some primary color filters were used in the previous

tables to reduce the number of filters and keep the
exposure adjustment to a minimum. Red filters were
substituted for equivalent filtration in magenta and yellow.
Blue filters were substituted for equivalent filtration in cyan
and magenta.

Fluorescent Lamp

KODAK Color

Compensating

Filters

Exposure

Adjustment

Daylight

50R

+ 1 stop

White

40M

+ 2/3 stop

Warm White

20C + 40M

+ 1 stop

Warm White Deluxe

30B + 30C

+ 1 1/3 stops

Cool White

40M + 10Y

+ 1 stop

Cool White Deluxe

20C + 10M

+ 2/3 stop

Unknown Fluorescent†

30M

+ 2/3 stop

High-Intensity Discharge

Lamps

KODAK Color

Compensating

Filters

Exposure

Adjustment

General Electric Lucalox†

80B + 20C

+ 2 1/3 stop

General Electric
Multi-Vapor

20R + 20M

+ 2/3 stop

Deluxe White Mercury

30R + 30M

+ 1 1/3 stops

Clear Mercury

70R

+ 1 1/3 stops

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