FujiFilm AF3-151E manual Exposure Under Various Light Conditions, Lighting Equipment

FUJIFILM PRODUCT INFORMATION BULLETIN • FUJICOLOR SUPERIA X-TRA 400 [CH]

4.EXPOSURE UNDER VARIOUS LIGHT CONDITIONS

Daylight

Even when exposed under morning or evening twilight conditions or when color temperatures are low, no spe- cial filter use is needed as color balancing can be done during printing.

Electronic Flash

•Electronic flash produces light similar to daylight, so filters are not needed. However, the possibility of un- desirable effects on color balance, due to various factors (differences in equipment, amount of use, etc.) should be taken into consideration. Test expo- sures are recommended.

•If shutter speeds slower than 1/60 second are used, light from non-flash sources, such as room lighting, may cause color imbalances. Make test exposures.

•The use of a flash meter is advisable, but the follow- ing formula can also be used to obtain satisfactory

lens opening.

Lens

Aperture = Electronic Flash Guide Number (at ISO 400) (f-number) Electronic Flash-to-Subject Distance (meters or feet)

•Set the film speed at ISO 400. Since the amount of light reflected onto subjects from surrounding sur- faces will differ with the conditions, refer to the flash unit instructions.

Daylight Photoflood/Photo-Reflector Lamps

•Daylight-type photoflood or photo-reflector lamp out- put may be lower than that indicated by an exposure meter, so it is advisable to compensate for this by in- creasing exposure time or the lens opening. When- ever possible, test exposures are recommended.

•Other factors requiring consideration when determin- ing the exposure time, are lamp configuration, use duration and line voltage, as they may affect lamp output and color balance.

Fluorescent Lamps & High-Intensity Discharge Lamps

•For the best results, the following combinations of color compensating filters are recommended. How- ever, for exacting work, test exposures are advisable.

		Fluorescent			High-Intensity
					Discharge
Lamp Type	Daylight	Cool	White	Warm	Deluxe	Clear
		White		White	White
	(D)	(C.W)	(W)	(W.W)	Mercury	Mercury
Color	10M			30C		40M
Compensat-		—	10C		10C
	+10Y			+30M		+40Y
ing Filters*
Exposure	+1/3	—	+1/3	+1	+1/3	+1 1/3
Corrections**

*Fuji Color Compensating Filters (or Wratten Color Compen- sating Filters)

**Exposure correction values include filter exposure factors. These values are added to unfiltered exposure meter read- ings. A “+” followed by a number indicates the required in- crease in lens opening.

•When the fluorescent lamp characteristics are un- known, to obtain generally acceptable results, use a 30M compensating filter and open the lens one stop (+1).

NOTE Different compensation may be required according to special lamp types and length of use, so test expo- sures are recommended, whenever possible.

•Shutter speeds of 1/125 second for high-intensity discharge lamps and 1/30 second or larger, for fluo- rescent lamps, will avoid AC power-induced changes in brightness and color being recorded on the film.

Tungsten Lamps

AFuji Light Balancing Filter LBB-12 (or Wratten filter No.80A) is recommended along with a 2-stop increase in lens opening, when using 3200 K tungsten lighting. In the case of cameras with TTL metering, there is no need for additional exposure compensation.

5. LIGHTING EQUIPMENT

The condition of umbrellas, reflectors, diffusers and like devices, could influence photographic light quality. Peri- odically check lighting equipment for deterioration.

6. LONG EXPOSURE COMPENSATION

No exposure or color balance compensation is required for exposures within a 1/4000 to 2 second shutter speed range. However, for exposures of 4 seconds or longer, provide the compensations indicated below.

Exposure Time (sec.)	1/4000 to 2	4	16	64
Exposure Corrections*	Unnecessary	+ 1/3	+ 2/3	+ 1

*A “+” followed by a number indicates the required increase in lens opening.

Except for special effects, the normal intensity ratio for main-to-fill subject lighting should remain within 1:4 lim- its.

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