Canon Auto Zoom 814 Manuel d'instructions - Page 21
Parcourez en ligne ou téléchargez le pdf Manuel d'instructions pour {nom_de_la_catégorie} Canon Auto Zoom 814. Canon Auto Zoom 814 36 pages. 8mm movie camera
Également pour Canon Auto Zoom 814 : Manuel d'instructions (40 pages)
Imprimer la page
21
The f ilm stops for
exposure
An advance of the
exposed frame
takes places
Variable Shutter Control
The shutter of an 8mm ·movie camera is coupled to film
advance.
The
exposure is decided by the rotation of two semicircular leaves at a given
angle. For every full turn, one frame is exposed and advanced. That is,
when the open part of the leaves faces the aperture gate the film stops for
exposure, and when the leaves shut the aperture gate the film
advances.
Therefore the exposure changes according to the rotation speed and the
angle of opening of the leaves. The rotation speed equals the filming
speed.
The angle of the leaves is called variable shutter angle. This camera has a
built-in mechanism to control the shutter angle, with which you can
control the exposures on the film. And you can also perform fading
tech niq ues with it
.
Adjusting the Exposure with the Variable
Shutter Control
The filming speed of an 8mm movie camera can not be changed at will
,
because its filming speed is normally decided to match the projection speed
of a projector. Therefore the exposure of an 8mm movie camera is
generally established by the aperture control. Then the variable shutter is
developed to control the exposure with the shutter itself as well as with the
aperture.
This means that the exposure is adjusted by means of the shutter
angle at the same filming speed
.
In the Canon Auto Zoom 814 Electronic, the shutter angle is variable from
150
0
to 0
0
continuously
.
A
four~step
scale is marked on the body to make
exposure control and fading techniques easier.
In ordinary shooting the variable shutter control is set at "OPEN". When
neCessary, the exposure can be controlled by rotating the variable shutter
control ring as much as required toward the "CLOSE" position.
How to Use the Variable Shutter Control Ring
1
Release the variable shutter control lock by pressing it in the direction
of the arrow.