HIKVISION DS-2CC5181P-VF User Manual page 77

Day/Night High-definition Dome Camera· User Manual
Or you can use a C/CS adapter ring between the camera and the
lens with C lens mount.
Problem 3:
The camera is installed w ith an auto-iris lens. You adjust the focus
to get a clear image in the daytime, but the image is defocused at
night.
Possible Reasons:
In the daytime, the illumination is high, so the iris is adjusted to a
small size automatically. The DOF (depth of field) is long. But at
night, the iris is adjusted to a large size automatically, so the DOF
is shortened. The focus you adjusted in the daytime now locates
out of the DOF, so the image is defocused at night.
To Solve the Problem:
When you adjust the focus for a camera w ith an auto-iris lens, you
need to set the lens type to AES (auto electronic shutter) mode.
Under AES mode, the iris is adjusted to the largest size
automatically. Then you can adjust the focus to get a clear image.
At last, you need to set the lens type back to AI (auto iris) mode.
Or you can adjust the focus in low illumination condition, such as at
night.
Problem 4:
A camera with OSD menu and an auto-iris lens displays black video,
but the OSD menu can be called and displayed.
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