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.

* For best results without special printing.

Daylight

Use the exposures in the following table for average frontlit subjects from 2 hours after sunrise to 2 hours before sunset.

Lighting Conditions	Shutter Speed (second)	Lens Opening
Bright or Hazy Sun on Light Sand or Snow	1/125	f/8
Bright or Hazy Sun (Distinct Shadows)	1/125	f/5.6*
Weak, Hazy Sun (Soft Shadows)	1/125	f/4
Cloudy Bright (No Shadows)	1/60	f/4
Heavy Overcast or Open Shade **	1/60	f/2.8

* Use f/2.8 for backlit close-up subjects.
** Subject shaded from the sun but lighted by a large area of clear sky.

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)*	Guide Number For Distances in Feet/Metres
350	20/6
500	24/7
700	30/9
1000	35/11
1400	40/12
2000	50/15
2800	20/18
4000	70/21
5600	85/26
8000	100/30

* BCPS = beam candlepower seconds

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.