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BELL 6 HOWELL
FILMO TOPICS
Published monthly in the interests of personal motion picture makers by the Bell & Howell Company, Chicago
Edwin A. Reeve . Editor
VOLUME 7 AUGUST, 1931 NUMBERS
Using the New Film
The new supersensitive panchromatic reversal film will work wonders — if you use it with these facts in mind
R. Fawn Mitchell
A.LL Filmo owners are naturally interested in the recent announcement of the new supersensitive panchromatic film. It is now well known and widely recognized that panchromatic film gives a more trueto-life black and white rendition of colored subjects, especially of orange and red colors. Therefore the introduction of the new supersensitive panchromatic film and the simultaneous withdrawal of orthochromatic film from the market will undoubtedly result in a considerable improvement in Filmo users' screen results.
six times as fast with incandescent light. In other words, outdoors it permits you to stop your lens down one more stop to get greater depth of focus, or to use the normal camera speed where previously you had to use half speed on account of poor light, as in early morning or near twilight. Indoors it permits you to work with one-sixth as much light as is necessary with orthochromatic film.
It is for indoor pictures that the new film will best prove its value. Refer to Figure 1.
It was taken on the new film with just average daylight filtering in through two small windows, while on the shadow side was one 60-watt bulb about ten feet away. If you have ever attempted to take a picture under these conditions even with ordinary panchromatic film, you know that you would have to use the fastest lens available and that, even then, it would be doubtful if all the detail in the shadows would be recorded. The stop used on this particular shot was F 3.5 at normal speed.
The characteristics of the regular panchromatic film are fairly well known. However, it will not be out of place to summarize them briefly, for you will probably be using much of this film from now on. In daylight it has the same speed as the orthochromatic film. Due to its increased color sensitivity, however, it is twice as fast as the old orthochromatic film when incandescent lighting is employed.
The new supersensitive panchromatic film, compared with orthochromatic, is twice as fast in daylight and
Figure 1. Taken indoors with the new supersensitive panchromatic film at F 3.5, using normal camera speed. Article explains the illumination used
It may be of interest to explain just why the 60-watt bulb, with its high percentage of red and yellow light ( ordinarily of little photographic value) is responsible for this illumination of the shadow details. The supersensitive film has about 500% greater sensitivity to red than even regular panchromatic film. It also has 200% greater sensitivity to green and 500% greater sensitivity to blue.
An interesting test was conducted with this new film to see just what it would do. In Figure 2. an ordinary 60( Continued on page eight)