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4.1 35mm 3 PERF OPTION
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0
20
19
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OPTIONAL SOFTWARE
4.1.1
3 Perf Numbering
On 35 mm film, the KeyKode numbers change once per foot, or every 64
perforations. There is also a mid-foot KeyKode number which is indicated
by a smaller human readable number and a perf offset of 32. In the 4 perf
format there are 4 perfs per frame, giving 16 frames per foot or KeyKode
number. In the 3 perf format there are 3 perfs per frame giving 21 1/3
frames per KeyKode number. Thus it takes 3 feet to give a whole number
of frames.
Evertz and several other manufacturers have agreed on a
standard way of numbering the irregular 3 perf footage. The first two feet
of the sequence have the Zero frame KeyKode reference dot at the head
and centre perfs of the frame respectively and each contain 21 frames.
The third frame of the sequence has the reference dot at the tail perf, and
contains 22 frames. The drawing below illustrates the numbering sequence
used for 3 perf.
.
18
17
16
15
14
13
18
17
16
15
14
13
18
17
16
15
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13
Figure 4-1: 3 Perf Film Numbering
Model 4025TR Film Footage Encoder Manual
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FOOT TYPE 1
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11
10
9
8
7
FOOT TYPE 2
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11
10
9
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FOOT TYPE 3
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4
3
2
1
6
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2
1
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2
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Page 4-2
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