Canon Auto Zoom 814 Anleitung Handbuch - Seite 21

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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

to 0

continuously

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

Release the variable shutter control lock by pressing it in the direction

of the arrow.