1) should arrive to be monitored according to camera the distance of the target, will choose to focus camera lens (the focal length of Fixed Focal Lens) .
Distinguish from focal length wide-angle lens of short focal distance, the part of the body cavity between the diaphragm and the umbilicus housing the spleen is apart from far camera lens of standard camera lens, long focal distance. Camera lens focal length expresses normally with the value, camera lens aperture expresses with F commonly, f takes a value to be measured with the ratio of the focal length ／ of camera lens and D of the aperture that connect light, f=f/d, on every camera lens all mark has its greatest F value.
The camera lens norms of 2) camera should with size of range of camera CCD target (1 ／ 2" is 3" of 6.4hX4.8 υ , 1 ／ to be 4" of 4.8hX3.6 υ , 1 ／ to be 3.2hX2.4 υ ) answer relatively. If camera lens dimension and size of range of camera CCD target are abhorrent when, observe angle will not accord with a design to ask, perhaps produce a picture to be beyond the focus wait for a problem.
The horizontal vision degree of 3) camera and perpendicular vision degree and HX of size of range of camera CCD target are like next relations between υ and F of camera lens focal length: 2f) of ／ of =2arctan (h of horizontal vision degree;
υ of =2arctan (of perpendicular vision degree / 2f) .
4) camera lens has automatic aperture (Auto Iris) and hand move aperture (the cent of Manual Iris) . Automatic aperture is used at be being illuminated content light change is more circumstance, the hand moves aperture to be used at be in by what stabilize according to content light.
Automatic aperture camera lens has kind of 2 kinds of drive: One kind is video input Video Driver(with Amp) , it carries signal of a video and power supply lens to control the aperture on camera lens from camera, the bag inside input of this kind of video camera lens contains amplifier circuit, the video signal that in order to transmits camera changes the control of didymous aperture motor, another kind calls DC input (DC Driverno Amp) , it uses the volts d.c. on camera to control aperture directly, motor of galvanometer type aperture is included only inside this kind of camera lens, there is amplifier circuit inside camera. Product of means of 2 kinds of drive is not provided but interchangeability, but already had now general-purpose automatic aperture camera lens is rolled out.
How does 5) camera lens contain C with CS model two kinds, the camera lens of C installation is much between CCD camera and camera lens the annulus that 5mm adjusts aperture to be worth. The camera of C installation can use CS camera lens, but the camera that CS installs cannot use C camera lens. Philips company rolls out revolutionary Wizard camera lens to install guide, those who assure camera lens and camera is completely compatible, this makes attainable below any environments best image.
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