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ISO 125/22º BLACK AND WHITE PROFESSIONAL FILM

FOR HIGH PRINT QUALITY AND FLEXIBILITY IN USE

FACT SHEET

April 2004

ILFORD FP4 Plus is an exceptionally fine grain,

medium speed, black and white film. It is ideal for

high quality indoor and outdoor photography,

particularly when giant enlargements are to be

made. In addition to general photography, FP4

Plus is also suited to copying and internegative

work, and has many applications in scientific,

technical and industrial photography.

FP4 Plus is robust and will give usable results even

if it is overexposed by as much as six stops, or

underexposed by two stops. It is compatible with

all major processing systems, including those

which give the standard short fixing and washing

times.

FP4 Plus 35mm film is coated on 0

125mm/5-mil

acetate base and is available in 24 or 36

exposure cassettes, or in bulk lengths of 17 and

5 metres (56 and 100ft). FP4 Plus 35mm film is

supplied in DX coded cassettes, suitable for all

35mm cameras.

FP4 Plus rollfilm is coated on 0

110mm/4-mil clear

acetate base with an anti-halation backing which

clears during development. It is available in 120

and 220 lengths and is edge numbered 1 to 19

(120) and 1 to 40 (220).

FP4 Plus sheet film is coated on 0

180mm/7-mil

polyester base with an anti-halation backing which

clears during development. It is available in a

wide range of standard sizes. The emulsion faces

the user when sheet film is held in the position

shown.

EXPOSURE RATING

FP4 Plus has a speed rating of ISO 125/22º

(125ASA, 22DIN, EI 125/22) to daylight. The ISO

speed rating was measured using ILFORD ID-11

developer at 20ºC/68ºF with intermittent agitation

in a spiral tank.

Best results are obtained at EI 125/22, but good

image quality will also be obtained at meter

settings from EI 50/18 to EI 200/24.

It should be noted that the exposure index (EI)

range recommended for FP4 Plus is based on a

practical evaluation of film speed and is not based

on foot speed, as is the ISO standard.

SPECTRAL SENSITIVITY

Wedge spectrogram to tungsten light

(2850K)

Wavelength nm

FILTER FACTORS

FP4 Plus film may be used with all types of filters

(eg colour, polarising and neutral density filters) in

the usual way. Follow the instructions given by the

filter manufacturer.

The exposure increase in daylight may vary with

the angle of the sun and the time of day. In the

late afternoon or the winter months, when daylight

contains more red light, green and blue filters may

need slightly more exposure than usual.

Cameras with through-the-lens metering will usually

adjust the exposure automatically when using

filters. With some automatic exposure cameras, the

correction given for deep red and orange filters

can produce negatives under exposed by as much

as 1

2 stops.

Sensitivity

Summary of content (6 pages)

PAGE 1
April 2004 FACT SHEET ISO 125/22º BLACK AND WHITE PROFESSIONAL FILM FOR HIGH PRINT QUALITY AND FLEXIBILITY IN USE ILFORD FP4 Plus is an exceptionally fine grain, medium speed, black and white film. It is ideal for high quality indoor and outdoor photography, particularly when giant enlargements are to be made. In addition to general photography, FP4 Plus is also suited to copying and internegative work, and has many applications in scientific, technical and industrial photography.
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FP4 Plus MAKING LONG EXPOSURES For exposures between 1/2 and 1/10 000 second, no adjustments are needed for reciprocity law failure. When exposures longer than 1/2 second are given, FP4 Plus, along with other films, needs to be given more exposure than indicated by a meter. Use the graph to calculate the increased exposure time which should be given once the measured time is known.
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FP4 Plus DEVELOPMENT TIMES The table gives development times for both manual and machine processing FP4 Plus. These times will produce negatives of average contrast suitable for printing in all enlargers. The development times are intended as a guide and may be altered if a different result is needed. For manual processing in spiral tanks and deep tanks, the development times are based on intermittent agitation.
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FP4 Plus o Temperature ( C) Note Development times may need adjusting to suit individual processing systems and working practices. If an established system is producing good results, adjust the recommended development times until the desired contrast level is obtained. Development times in other manufacturers’ developers are included for your convenience, and are only a general guide.
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FP4 Plus PROCESSING FP4 Plus can be processed in all types of processing equipment including spiral tanks, rotary processors, dishes/trays, deep tanks and automatic processors. Standard capacity figures and replenishment rates can be maintained. FP4 Plus is very robust in processing and will tolerate less than ideal processing conditions. Also, it will not contaminate the processing chemicals.
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FP4 Plus Generally for most applications modern camera films are sufficiently hardened at manufacture. Additional hardening from a fixer hardener is not usually needed or recommended for processing in spiral tanks, dishes/trays, deep tanks, rotary processors, dip and dunk (hanger) machines and short leader card processors, unless the processing temperature is above 30ºC (86ºF), or poor drying performance is being experienced.