This section is from the "Studio Light Incorporating The Aristo Eagle - The Artura Bulletin 1922 " book, by Aristo Motto. Also see Amazon: Studio Light Incorporating The Aristo Eagle - The Artura Bulletin 1922 .
WHAT the Eastman Filter Test Chart is, and does, is not perfectly clear to every photographer, we feel sure, but we believe it is sufficiently useful to every user of panchromatic films or plates to deserve an explanation.
The chart consists of two pieces of light cardboard bound together at the edges. There are eight circular openings at one side and through these may be seen the eight Wratten filters of the commercial set.
The openings are only five-eighths of an inch in diameter and the filters can not be removed. They are not intended for any other purpose than to hold to the eye to see how the object you expect to photograph looks when viewed through the different filters. The filters in the Test Chart are the K 1, K 2, and K 3, all of which are yellow; the G, which is a dark yellow; the A and F which are light and dark reds; the B, green and the C, blue.
Any colored object will photograph on a panchromatic film or plate with a filter about the same as it looks when viewed through the filter, so the Test Chart offers a convenient means of viewing an object through all of the filters and choosing the one that seems most suitable.
In addition to these small samples of the regular filters there are four test filters which are seen through larger openings. These are really the greatest help in determining what filters and materials to use.
The first test filter on the chart is blue. If the object viewed through this filter looks good, use an ordinary film or plate without a filter and the result will be good.
If the object looks best through the second test filter, which is green, it will be possible to secure practically the effect you see by using an orthochromatic film and a yellow filter, as this film is sensitive to green.
The third test filter is a peculiar color, unlike any of the filters that are actually used. But if the object viewed through it appears to best advantage it indicates that a panchromatic plate and a K 3 filter will give the desired result.
The fourth test filter is red. If the object viewed through this appears more satisfactory than through any of the other filters a panchromatic film or plate and the red A filter should be used.
The Filter Test Chart is not actually used in photographing, but it is a guide which will materially aid you in selecting the correct filter and material to produce the best possible result when photographing colored objects.
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