AgfaPhoto 5C3WD Datasheet download pdf (Page 2)

General comments

Vista and APS star

A film's colour rendition is governed by a number of factors. The

emulsions' spectral sensitivity or sensitisation is particularly

important, when it comes to reproducing true-to-nature colours

with the maximum accuracy. By means of the EYE VISION

technology incorporated in all Vista and APS star films, it is

now possible to match, to a large extent, the films' sensitisation

to the colour perception of the human eye. The effect is shown

schematically in the following diagrams. The EYE VISION techno-

logy achieves more accurate colour fidelity, and largely elimi-

nates the colour falsifications present in films with conventional

sensitisation such as:

• an unpleasant green cast with fluorescent light (e.g. neon tubes),

• a shift towards red in certain blue-coloured flowers (hortensia,

clematis, delphinium etc.),

• the brown rendition of particular green fabric colours,

• the absence of texture in certain red colours (e.g. roses).

Directions for use

Film speed

Today‘s ISO values are a combination of the former ASA and

DIN values. The following table illustrates this point.

In principle, all these speeds are for all photographic situations

that might occur under normal circumstances (e.g. people, por-

traits, landscapes, groups, buildings, holidays, animals, plants,

flowers, documentation etc.). Nevertheless, it is still worth-

while observing a number of simple rules in the choice of the

film speed.

Camera setting

Modern cameras adjust themselves automatically to the film

speed (by reading the DX code). Cameras without automatic

lighting control must be set manually to the film speed stated

on the pack.

Exposure latitude

Most cameras have automatic exposure control, which sets the

most favourable ratio of exposure time and aperture. Neverthe-

less, many photographs are not correctly exposed, because the

automatic control of some cameras cannot cope with unusual

or critical lighting conditions. Backlit shots are a typical exam-

ple. Without lighting adjustment, the negative or slide may well

end up being under-exposed by one or two f-stops. Depending

on the film type, AgfaPhoto films tolerate exposure errors

up to 5 f-stops (under-exposure up to 2, over-exposure up to

3 f-stops) without noticeable reductions in quality.

Exposure notes

When in doubt, it is good to err on the generous side in the

exposure of colour negatives (i.e. stop up = lower f-number),

but to be more cautious with slide films (i.e. stop down slightly

= higher f-number). In this way you are always on the safe side:

over-exposing a negative film and slightly under-exposing a

slide film produces an increase in colour saturation.

450 550 600 650500400

previously

Spectral sensitivity of the film emulsions

blue

green

red

blue

green

red

Spectral sensitivity of the eye

ISO ASA DIN In comparison to ISO 100/21°

100/21° 100 21°

200/24° 200 24° twice as fast

400/27° 400 27° four times as fast

ISO ISO ISO

100/21° 200/24° 400/27°

Lightning

– Bright, e. g. cloudless x x x

– Medium, e. g. overcast x x

– Weak, e. g. dawn x

Moving subject*

– Almost motionless x x x

– Medium-fast x x

– Fast x

Lens*

– High speed x x x

– Low Speed x x

Flash (medium light output)

– small rooms x x x

– Large rooms x

* Depending on the lighting

Agfa Photo Broschüre_14-6 engl 11.01.2008 18:38 Uhr Seite 2

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AgfaPhoto 5C3WD Datasheet Page 2

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