Use the exposure index numbers in the table below with cameras or meters marked for ISO or ASA speeds. Do not change the film-speed setting when metering through a filter. Metering through filters may affect light meter accuracy; see your meter or camera manual for specific information. For critical work, make a series of test exposures.
| Light Source | KODAK WRATTEN Gelatin Filter* | ISO Speed |
|---|---|---|
| Daylight or Electronic Flash |
None | 50 |
| Photolamp (3400 K) | No. 80B | 16 |
| Tungsten (3200 K) | No. 80A | 12 |
| *For best results without special printing. |
Use the exposures in the table below for average frontlighted subjects from 2 hours after sunrise to 2 hours before sunset.
| Lighting Conditions | Shutter Speed (seconds) |
Lens Opening |
|---|---|---|
| Bright or Hazy Sun on Light Sand or Snow |
1/125 | f/16 |
| Bright or Hazy Sun (Distinct Shadows) | 1/125 | f/11* |
| Weak, Hazy Sun (Soft Shadows) | 1/125 | f/8 |
| Cloudy Bright (No Shadows) | 1/125 | f/5.6 |
| Heavy Overcast or Open Shade** | 1/125 | f/4 |
| *Use f/5.6 for backlighted close-up subjects. **Subject shaded from the sun but lighted by a large area of clear sky. |
Use the appropriate 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 slides are consistently too thin (overexposed), use a higher guide number; if they are too dense (underexposed), use a lower number.
| Guide Number | ||
|---|---|---|
| Unit Output (BCPS)* | For Distances in Feet | For Distances in Metres |
| 350 | 30 | 9 |
| 500 | 35 | 11 |
| 700 | 40 | 12 |
| 1000 | 50 | 15 |
| 1400 | 60 | 18 |
| 2000 | 70 | 21 |
| 2800 | 85 | 26 |
| 4000 | 100 | 30 |
| 5600 | 120 | 36 |
| 8000 | 140 | 42 |
| *BCPS = beam candlepower seconds |
Use the color-compensating filters and exposure adjustments in the tables below as starting points to expose this film 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.
| Type of 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 |
Note: When you don't know the type of fluorescent lamps, try a 30M filter and increase exposure by 2/3 stop; color rendition will probably be less than optimum.
| Type of High-Intensity Discharge Lamp |
KODAK Color Compensating Filters | Exposure Adjustment |
|---|---|---|
| General Electric Lucalox* | 80B + 20C | +2 1/3 stops |
| 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 |
| *This is a high-pressure sodium-vapor lamp. The information in the table may not apply to other manufacturers' high-pressure sodium-vapor lamps because of 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.
No filter correction or exposure compensation is required for exposures from 1/10,000 to 10 seconds.
Note: This information applies only when the film is 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.