Hi all. I have come across a can of old 35mm sound test films which included the following set of loops. They all have handwritten labels (see below) and seem to be an incomplete set. They are all on Safety Film base.
A - 400 Hz 50% Optical (KS perforations)
B - 35 Hz HI Optical (KS perforations)
C - 35 Hz LO Optical (KS perforations)
D - 25 Hz Optical (KS perforations)
F - 400 Hz 50% Optical (KS perforations)
35 Hz LO
25 Hz HI
I - 400 Hz 50% with optical
15 Secs No Signal
35 Hz LO
25 Hz HI
This last one is 4 track Mag/Optical with Cinemascope perforations.
Does anyone have any idea how this set of test films was meant to be used? They seem to be out of the ordinary range of optical sound alignment films, possibly for some kind of special evaluation or process. They were found in a country cinema, along with some old projection equipment including parts of RCA rotary stabilized sound heads, and the remains of some Western Electric Universal Bases. There was also a quantity of original Cinemascope picture alignment film. The location was a bit remote from major towns and the management always tried to be technically self-sufficient. I'm puzzled especially as to why there are the very low-frequency loops.
Any insight will be welcome.
A - 400 Hz 50% Optical (KS perforations)
B - 35 Hz HI Optical (KS perforations)
C - 35 Hz LO Optical (KS perforations)
D - 25 Hz Optical (KS perforations)
F - 400 Hz 50% Optical (KS perforations)
35 Hz LO
25 Hz HI
I - 400 Hz 50% with optical
15 Secs No Signal
35 Hz LO
25 Hz HI
This last one is 4 track Mag/Optical with Cinemascope perforations.
Does anyone have any idea how this set of test films was meant to be used? They seem to be out of the ordinary range of optical sound alignment films, possibly for some kind of special evaluation or process. They were found in a country cinema, along with some old projection equipment including parts of RCA rotary stabilized sound heads, and the remains of some Western Electric Universal Bases. There was also a quantity of original Cinemascope picture alignment film. The location was a bit remote from major towns and the management always tried to be technically self-sufficient. I'm puzzled especially as to why there are the very low-frequency loops.
Any insight will be welcome.
Comment