[Konvas] Sond Barneys

[Peter Haas]

On Sep 3, 2009, at 7:23 PM, Dan Cordle wrote:

> For your amusement, here's an old photo of a sound proof camera  
> booth: www.guidodeiro.com/images/vitarecording.jpg

That is a Bell & Howell 2709, and it was never intended for sound  
shooting.

It's "Unit-I" shuttle is exceptionally noisy when operated above 16  
fps, its nominal limit.

For 24 fps shooting, a High Speed shuttle would usually be  
substituted, with a considerable reduction in noise. But, the high  
speed shuttle had no registration pins.

Camera noise finally got well under control with Mitchell's  
"compensating link" movement (about 1932), which was originally used  
on the NC, and which eventually became the BNC, FC, BFC, and all  
their many derivatives, including the Panavision R-200.

This Mitchell movement was even retrofitted to the Technicolor Three- 
Strip.

The "compensating link" movement has no gears, and only one cam, the  
pull-down cam. A standard movement has two gears and two cams.

The registration pins, formerly actuated  by a gear system and a  
secondary cam, were actuated by a specially designed linkage  
mechanism, connected to the tail of the pull-down claw, and which has  
a "dwell" built into it (the so-called "compensation") so the  
registration pins and the pull-down claws overlap, somewhat, in their  
action, thereby always having at least one of the two, or both,  
inserted into the perfs.

It is for this reason that the perf which is associated with  
registration is always different than the perfs which are associated  
with pull-down.

The perf immediately below the gate is for registration. The next two  
perfs are for pull-down.

This is not true, however, for 3 or 2 perfs, but it is for 4 or 6 (or  
more) perfs.