BEAULIEU 4008 - Automatic Diaphragm Control System; Manual Diaphragm-Setting Ring

depth of focus available with the aperture used. It allows special
soft-focus effects.
The screen can be retracted by the actuating knob. The image is
then only virtual and focussing is less precise. This method is to be
preferred when the operator attaches greater importance to luminous
viewing than to pinpoint focus (filming at infinity with high-sensitivity
film and a very small aperture, poorly-lit subjects, endoscopic pic-
tures, microcinematography, etc. (12).
K : Automatic diaphragm control system
(Reglomatic)
The Reglomatic device ensures automatic diaphragm control accord-
ing to the amount of light transmitted to the photocell by the reflex
viewfinder; it acts directly on the iris diaphragm of the lens (whence
its strength and reliability, and better definition of the resulting pic-
ture). The automatic lens can be removed from the camera, and
replaced by non-automatic lenses.
L: Manual diaphragm-setting ring
This ring controls the amount of light admitted. It is driven by a
micro-motor controlled by a transistorized system which interprets
the variations in the light received by the reflex cell. (13).
When the master switch is in the "Auto" position, this ring turns
by itself and stops when the ideal exposure value has been reached.
When the master switch is set to "Manuel", this ring has to be set
by hand according to the data given by the cell (pointer in the
viewfinder).
13