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MOTION PICTURE PHOTQGR A P H Y
one-sixteenth or one-thirty-second; a one-third opening, oneforty-eighth, etc. Now the diaphragm numbers on a lens, whether they be U. S. or F system, are arranged so that each higher number gives just half the exposure of the one below it. Also, U. S. i6 and F i6 are equal. Now let us figure: Suppose
An exposure chart for motion picture work is given here. F system is used.
Month and Weather
11
A.M.
to
1 P.M.
10-11 and 1-2
9-10 and 2-3
8-9 and 3-4
7-8 and 4-5
6-7 and 5
5-6 and 6-7
Jan., Nov., Dec.
Bright Sun
Hazy Sun
Diffused light . . . Dull
22 16 11
8 4
16
11 8
5.6 3.5
11
8
5.6
4
Very Dull
Feb., Oct.
Bright Sun
Hazy Sun
Diffused light . . . Dull
22 16
8
5.6
4
16 8
5.6 4 3.5
11
5.6
4
3.5
8
5.6 4 3.5
Very Dull
Mar., Apr., Aug., Sept.
Bright Sum
Hazy Sun
Diffused light . . . Dull
32 22 16 11
8
32 22 16 11
8
22 16 11
8 5.6
22 16 11
8
5.6
16 11
8
5.6
4
11
8
5.6 4 3.5
Very Dull
May, June, July
Bright Sun
Hazy Sun
Diffused light . . . Dull
32 22 16 11
8
32
22 16
'I
22 16 11
8 5.6
22 16 11
8 5.6
11 8
5.6 4 3.5
8
5.6 4 3.5
5.6
4
3.5
Very Dull
our table of exposure says that under the conditions that obtain where we wish to work that the normal exposure is one-fourth second at U. S. thirty-two. The next lower stop is U. S. i6, which is twice as fast, therefore, at U. S. i6 we can expose in one-eighth second. Now our cinematograph lens is perhaps marked in the F system. F ii is next below F i6 with an expMDsure of one-sixteenth second. The most we can give is onethirty-two second with our shutter as far open as we can use it, we must open our diaphragm still further in order to get enough light through our lens to make the picture in one-thirty-two
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