Eneo VKC-1360 Installation And Operating Instructions Manual page 39

Adjustment
of flange focus for
variable focus lenses
Note
Addition when using
lenses for day/night
application
Explanation of terms for iris setting
AGC (automatic gain
control)
White clip
AES (automatic shutter
control)
AES (automatic shutter
control)
Undo set screw 1 and turn the lever on the camera until an optimal
sharpness is reached. Repeat the process for checking purposes,
if necessary.
When finished, retighten screw 1.
The value stated in the diagram as AL (depth of thread of the lens
with CS mount: <- 5mm) must be observed. The camera may be
damaged if this value is exceeded.
When installing a lens with CS mount, never use the C mount
adapter ring.
Even if the lens is a day/night lens with stabilised focus regulation
0-focus shift), a minor flange focus is possible between visible light
and IR light.
If there is a day/night application with IR illumination, the flange
focus should be set under IR light conditions. This is because the
iris is generally opened when used at night due to the poor level of
light and low depth of focus. During the day, the iris is continuously
closed further, there is a greater depth of focus and the difference
in the flange focus is compensated.
This starts to operate when the light intensity is insufficient to
deliver a full video signal (Vp-p). The greater the gain, the greater
the signal noise in the picture.
It is generally activated between 0.8 and .0Vp-p.
Signal limitation at high image amplitudes.
The white clip value generally lies between . and . Vp-p.
This automatically controls the shutter times, it starts when the
light intensity becomes stronger and the signal would otherwise be
limited/over-regulated by the white clip feature. Automatic shutter
control is mainly applied for manual lenses.
If a camera is operated with controlled lenses, regardless of
whether DC or AI, the AES must be switched off. Problems arise if
this is not done because both control systems try to steer the vo-
lume of light for the camera. As the AES generally reacts faster, the
iris remains fully opened and the shutter resumes the control work,
which produces major drawbacks. As the iris is open, the depth of
focus is very low. When shutter times are short, this can cause a
smear effect (bright, vertical stripes in light parts of the picture).
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