User`s manual

User’s Manual
29
NOTE: The difference between optical and digital zoom is that optical
zoom uses the lens within the camera to draw the image closer by
zooming in or out to achieve the desired effect. Optical zoom retains the full
resolution and quality of the zoomed image. By contrast, digital zoom takes a
portion of the image and expands that portion to the full size of the image;
however the image quality will be reduced.
18×/26× Model:
On these models, a maximum 12× digital zoom function can be enabled. The
default setting is <ON>.
22×/23×/35× Model:
On these three models, the digital zoom ratio is adjustable from <02> to <12>.
The default setting is <OFF>.
• SLOW SHUTTER
The shutter speed determines how long the image sensor is exposed to light.
To see a clear image in a dark environment, enable this function and select a
slower shutter speed.
18×/26× Model:
When this digital slow shutter function is enabled, the PTZ Camera will
automatically adjust the shutter speed based on the lighting conditions in the
installation environment. It enables users to see objects in a dark environment
below 0.2 lux.
23×/35× Model:
The shutter speed is adjustable in 23× and 35× models. With the slowest
shutter speed, the user can see objects in a dark environment below 0.2 lux or
see a smooth video image with a higher shutter speed. The options are from
<1/2> to <1/60> for NTSC and <1/1.5> to <1/50> for PAL.
• IMAGE INVERSE
Users can select <ON> to make the displayed image inversed vertically and
horizontally (see the figures shown below). Occasions to employ the function
include conferences, demonstration, testing, etc. For 22×, 23× and 35×
models, when this function is enabled, the preset mask(s) will be set off
automatically (see section 3.3.21 Privacy Mask). The default setting is
<OFF>.