Quasar CF-4251 User and Installation Guide
8
5.3
Lens Mounting
Before installing your camera, install the camera lens.
Note:
The camera lens is sold separately and should be selected to match the needs of the
scene and to optimize the use of the camera capabilities. See
Mounting and Lens
Accessories
.
Auto Iris vs. DC lens
A manual iris lens is best for use in scenes where illumination never changes, such as a persistently
lit store or office. Auto iris is better suited for scenes where the lighting may vary throughout the
day and night.
Note:
A smaller focal length number allows a wider field of view. A larger focal number
represents a narrower and deeper field of view.
The trade-off is in the amount of detail and depth of view vs. the width of view. For example a 2.8 or
4 mm lens might be sufficient for indoor warehouse and office and an 8mm might be better suited
for outdoor perimeters.
After you select your lenses and see the amount of detail provided consider your security
surveillance coverage, camera locations and any additional needs that may be discovered. Consult
your DVTEL rep if you have any questions.
To mount a lens on the CF-4251 camera
1.
Remove the plastic insert covering the threaded camera lens-mount.
Tip:
Do not touch the sensor or allow dust to accumulate in the lens-mount.
2.
If you are using a C-mount lens, screw a 5mm adapter ring into the C-Mount to
convert it to a CS-Mount (see Figures below).
C to CS Mount Adapter
Completion
3.
Align the lens threads into the lens-mount and screw on the lens.
