Adjusting Zoom And Focus - Swann Pro Series Instruction Manual

Adjusting Zoom and Focus

The zoom and focus controls are located on the interior of the dome, just above the lens.
You'll need to remove the cover of the dome (using the included star-key tool) to access
them and then use a small flat-blade screwdriver to turn the zoom and focus control rods.
Important: When you change the zoom, you'll also have to change the focus.
Why? Lenses are complicated, and all the bits are joined together. Changing the zoom
will also change the focus. In fact, it can sometimes feel like the controls are reversed, so
profound are their effect on one another.
ZOOM: The rear lever (when viewed from
the front of the lens, as shown on the right)
controls the level of zoom. Twist the lever
anti-clockwise a little to release the lens and
then you can vary the viewing angle between
23° and 81°. This is an approximately 4x
(2.8mm-12mm) optical zoom, which operates
in a similar manner to the zoom on your
digital camera. Basically, zooming in makes
everything appear to be larger, at the expense
of the width of the viewing area.
Check out the diagram to the lower right for a
visual representation of the zooming process.
The smaller viewing angle (marked 23°)
represents the camera's view when "zoomed
in", and the larger angle (81°) represents the
camera's view when "zoomed out".
You can set the zoom to either of these
extremities, or anywhere in between.
Once you have adjusted the camera to your
desired setting, twist the zoom lever gently
clockwise until it is firm to stop the lens
moving.
✐
When the camera lens is fully extended
(i.e., zoomed out), it's perfectly normal for
vignetting to occur to some degree. Vignetting
is a technical term in photography to describe
the darkening of corners in the image that
you're seeing. To avoid the vignetting effect, increase the zoom of the lens by a small
increment. This also means your camera will have a slightly reduced viewing angle.
3
Focus Zoom
23°
81°