Canon 814XL - Manual (Page 59)

* In regular shooting with manual aperture con­
trol, the best effect is attained between f/2 and
f/11.
* For shooting titles, please make the light
stronger so that the aperture can be set at f/5.6
or smaller.
Variable Shutter Control Mechanism
Exposure with this 8mm camera is controlled by
the angle rotation of semi-circular shutter blades.
One rotation gives the exposure for one frame.
As the shutter rotates it alternately passes and
blocks light from passing through the aperture
and exposing the film. When the shutter blades
cover the aperture, the film is advanced to the
next frame and when the blades uncover the
aperture, the film is stationary and is exposed.
Therefore the exposure is changed depending
upon the rotation speed and the opening of the
shutter blades. The rotation speed is also called
the filming speed and the opening of the shutter
blades is called the shutter opening angle. This
camera has a mechanism that controls the shut­
ter opening angle, changing the opening angle to
control exposure and fading when shooting.