Page 15 - The Wellington photographic handbook

-WELLINGTON ANTI-SCREEN PLATE.

Every photographer knows that an ordinary plate is
almost completely insensitive to yellow, green and red. Conse-
quently it renders those colours as black, or nearly so. The
invention of the isochromatic plate somewhat remedied this
defect, but the sensitivity to yellow and green was still so
small in proportion to the sensitivity to blue and violet, that
only by the use of a light filter to cut out the greater part of
the blue and violet rays was the plate able to show any appre-
ciable improvement in colour rendering. Moreover, the use
of a light filter necessitated an increase in the exposure of some
four or five times, and so the hand camera worker, whether he
used ordinary or isochromatic plates, had still to be content
with the old false colour-rendering, in which yellow, the most
brilliant colour in nature, was rendered as only a few shades
lighter than black.
The WELLINGTON ANTI-SCREEN plate is an
isochromatic plate, but unlike an ordinary isochromatic plate
is capable of giving an exceedingly fine rendering of the greens
and yellows without the use of a light filter. In portraits,
landscapes and seascapes, in flower studies and in architectural
work, the problem of coirectly rendering colour is always
present, and always the Anti-Screen plate is capable of
solving it satisfactorily. When the Anti-Screen plate is used
in portraiture the work of retouching is reduced and a more
perfect rendering of the hair and of flesh tones is secured.
It is a characteristic of the Anti-Screen plate that it is
almost free from halation, even when used unbacked.
The Anti-Screen plate is only a little slower than the
fastest plates made, and is therefore ideal for the hand camera.
Provided with the Anti-Screen plate the photographer is able
to deal successfully with almost any subject that may present
itself, from a flower study to an aeroplane in flight.
The speed is 300 H. & D., 270 Watkins or F/105
Wynne.

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