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November— December, 104-1 THE CINE-TECH N I C T A \
111
man. as the proprietary makes of filter which are lifted are of the varieties which are available to these workers.
When the chart is first opened the five colours ami their monochrome rendering are seen in juxta] m >-i t ii ai with a. half-tone chart showing, somewhat approximately and generally, the monochrome renderings of the same colours on panchromatic film in daylight with K) different coloured filters. These filters are then divided for consideration into 4 sections, yellow . green, red and blue respectively, two pages being devoted to each section with easy-reference index tabs. At the top of each pair of pages the appropriate group of monome reproduction strips is repeated. Below this the colours absorbed by l-.-u-Ii filter are stated, together with a note of the preferred purpose for which it may be employed. Finally there is a list ol the proprietary filters available.
Four pages are devoted to classification of us sensitive materials into the three classes appropriate for use with the rotating Filter Selecting Disc, while three more pages deal with Choice of Filters, under the headings oJ Subject, Effect Wanted. Filter Required, Sensitive Material. In this chart no distinction is made between the two types of panchromatic material.
We cannot give the same meed of praise to this chart as we have been able to accord to some other
of the Focal Press productions. Firstly tin i not the same evidence of care in preparation. Of several printers' errors one at least is likely to be misleading to the tyro, while there an two inaccurate cross references.
The question of artificial light is not dealt with satisfactorily. The author refers to *' incandescent photographic light," but does not explain what he means by this, and has nothing to say about the different colour content of photoflood as compared with normal electric incandescent lighting and other forms of lighting. In a publication which purports to treat of the behaviour of filters we regard this as a serious omission, ft greatlj reduces the potential value ot the rotating selector disc.
On the other hand the chart will be of considerable value to the tyro in that it will tend to dissipate the fog of uncertainty which will exist in his mind as to the general behaviour and choice of suitable filters By treating of them simply as Medium Yellow."' " yellow-Green," "Orange" and so on, and by giving a visual comparative chart of the relative effects, it will remove much of the mystery, and put him on the road to intelligent selection. We should, however, like to have seen a brief explanation as to why a " Filter Factor " is necessary.
George H. Sewell
MERTON PARK STUDIOS
A Modern, compact Studio with up-to-date equipment,
where more than 120 SKILLED TECHNICIANS and staff
are fully engaged in making
INSTRUCTIONAL, DOCUMENTARY AND TRAINING FILMS
for His Majesty's Government.
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MERTON PARK, LONDON, S.W. 18. telephone-, liberty mi
One mile from Wimbledon Station