ILFORD 100 DELTA PROFESSIONAL User guide

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ILFORD 100 DELTA PROFESSIONAL is a medium
speed, fine grain, black and white film, ideal for
pictorial and fine art photography.

100 DELTA Professional 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

30.5 metres (100ft). 100 DELTA Professional
35mm film is supplied in DX coded cassettes,
suitable for all 35mm cameras.

100 DELTA Professional rollfilm is coated on

0.110mm/4-mil clear acetate base with an anti­halation backing which clears during
development. It is available in 120 lengths and is
edge numbered 1 to 19.

100 DELTA Professional sheet film is coated on

0.180mm/7-mil polyester base with an anti­halation 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

100 DELTA Professional has a speed rating of ISO
100/21

º (100ASA, 21DIN, EI 100/21) to daylight.

Best results are obtained at EI 100/21, 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 100 DELTA

Professional 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

100 DELTA Professional 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

1/

2

stops.

DELTA

PROFESSIONAL

ISO 100/21º, FINE GRAIN, BLACK AND WHITE PROFESSIONAL FILM
FOR SUPERB PRINT QUALITY

September 2002

Sensitivity

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,
100 DELTA Professional 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.

Measured exposure time (sec)

100 DELTA PROFESSIONAL

Adjusted exposure time (sec)

CHOOSING THE BEST ILFORD DEVELOPER FOR THE JOB
Manual processing (eg spiral tank, dish, deep tank) and rotary processors

Liquid Powder
Best overall image quality ILFOTEC DD-X ID-11 (stock)
Finest grain (EI 100/21) ILFOTEC DD-X PERCEPTOL (1+1)
Finest grain (EI 50/18) ILFOTEC DD-X PERCEPTOL (stock)
Maximum sharpness ILFOTEC HC (1+31) ID-11 (1+3)
Maximum film speed ILFOTEC DD-X MICROPHEN (stock)

(EI 200/24)
One-shot convenience ILFOSOL S (1+14) ID-11 (1+1)

ILFOTEC DD-X MICROPHEN (1+1)
Economy ILFOTEC LC29 (1+29) ID-11 (1+3)

MICROPHEN (1+3)

Replenishable ILFOTEC HC ID-11

MICROPHEN
PERCEPTOL

Machine processing

Dip and dunk ILFOTEC DD Best overall image quality (liquid) and long tank life

ID-11 Best overall image quality (powder) and long tank life

MICROPHEN Maximum film speed and long tank life

ILFOTEC HC Flexible process time, range of dilutions and economy
Short leader ILFOTEC RT RAPID Rapid processing, best overall image quality and

long tank life

ILFOTEC HC Range of dilutions, flexibility and economy
Roller transport ILFOTEC RT RAPID Rapid processing

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