User Manual

www.acti.com
Firmware User’s Manual V6.09.45
77
Slowest Auto Shutter Speed is the user defined threshold for slowest allowed speed of auto
shutter. For example, if by default the shutter speed would vary between 1/5s ~ 1/2000s
depending on the lighting conditions, then setting the Slowest Auto Shutter Speed to 1/30s would
narrow down the auto shutter range to work between 1/30s ~ 1/2000s. The purpose of allowing
user to define the threshold for slowest speed is to avoid motion blur caused by too slow shutter
at night.
It is also important to know that very high shutter speed is not recommended for indoor solutions
with artificial light that flashes with certain frequency, as it may produce flickering effect,
regardless of Exposure mode.
In extreme low light conditions, the shutter speed is slown down to get more light into one image,
but not slower than the user defined threshold.
If the exposure time extends beyond the interval between frames (too slow shutter), (i.e. 1/30
second), then the frame rate will be automatically reduced. Longer time in this value gives
clearer images at night for slow moving objects, but more motion blur for fast moving
objects.
Exposure Mode - Manual
When the lighting conditions are stable 24 hours a day, the advanced users may consider using
manual exposure mode, to further fine tune the image quality in order to fulfill the special project
requirements. Please note that in most cases, it is highly recommended to keep the camera in
Auto Exposure mode and let the intelligent system of the camera find the best possible exposure
settings instead.
In manual exposure mode, the user can directly manually adjust the signal Exposure Gain,
Shutter Speed, and even on select models, the IRIS Control (I-series zoom cameras only).
NOTE: WDR is disabled in manual exposure mode (see Image on page 72).
After changing any of the items above, press Apply to save the changes. The Reset button
undoes the changes that had just been made but not Applied yet.