Bosch MegaPixel IP Camera NWC-0900 - Manual (Page 16)

14 en | Camera reference MegaPixel IP Cameras
F.01U.064.422 | V 1.0 | 2007.03 User Manual Bosch Security Systems
3.4 Network cabling
Category 5 cabling or better is recommended. All network
cabling must be installed according to applicable codes and
regulations.
3.5 Optics
The MegaPixel cameras should be used with a 1/2" or larger
optical format lens. The NWC-0900 requires two manual-iris
lenses and has a limitation on lens diameter (<38mm).
3.5.1 Using manual iris lenses
Choosing the lens correctly is very important for megapixel
cameras. A poorly selected lens may cause the image to appear
blurry when the lens iris is fully opened or closed too far. To
deliver sharp megapixel resolution images you should:
–
Use megapixel-resolution lenses;
– Obtain best resolution and depth of focus by having the
iris slightly closed.
When setting up the camera, direct it at the scene and try clos-
ing the iris by several F-stops. At some point the image will look
its sharpest. Leave the iris closed at this value. In situations
where motion-blur can be expected, an iris value should be
selected that gives best balance of resolution, depth of focus,
and motion blur.
3.5.2 Auto-iris lenses
Standard DC auto-iris lenses can be used with the NWC-0700
and NWC-0800 cameras. Cable shall be minimum 20 mm or
longer.
3.5.3 Using auto-iris lenses
NWC-0700 and NWC-0800 are available with DC auto-iris
option. To use the DC auto-iris lens:
1.
Attach the lens to the camera.
2. Plug the lens cable into the connector on the back of the
camera. Make sure that the lens cable is long enough.
Many DC lenses are available with short and long cable
options.
The camera will automatically detect the presence of an auto-
iris DC lens and start using it. Auto-iris lens operation typically
proceeds as follows:
–
If illumination is sufficient, the camera will close the iris
within half-a-minute.