Business: zoom lens Seiko lens light suppression camera
There are two kinds of C type and CS type, both threads are 1 inch 32 teeth, a diameter of 1 inch, the difference is that the distance between the lens and the CCD target surface is different, the distance from the reference plane to the focal point of the C type mount is 17.562 mm There is one more special collar length than the CS type distance CCD target surface, and the CS type distance from the focal point is 12.5 mm. Do not underestimate this one ring, if you do not have it, the lens and camera can not focus properly, the image becomes blurred. Therefore, before installing the lens, first look at the camera and the lens is not the same interface, if not, you need to increase or decrease the ring according to the specific circumstances. Some cameras do not need to be connected to the ring, but use the rear image adjustment ring (such as Panasonic products), adjust, use a screwdriver to loosen the screw on the adjustment ring, turn the adjustment ring, then the CCD target surface will be relative to the installation base back (front) Sports also play a role in the circle. In addition (such as SONY, JVC) uses a similar way like the adjustment ring, and its fixing screws are generally on the side of the camera. After loosening, adjusting one of the top gears can also make the image clear without adding or subtracting collars.
AGC ON/OFF (Auto Gain Control): The camera has a video amplifier that amplifies the signal from the CCD to a level that can be used. Its amplification, ie, gain, is equivalent to having a higher sensitivity, while the amplifier is in a bright light environment. Will overload, distorting the video signal. When the switch is ON, the lens aperture is fully opened under low-light conditions, and the gain is automatically increased to obtain a clear image. When the switch is OFF, a natural, low-noise image can be obtained at low brightness.
ATW ON/OFF: When the switch is turned ON, the characteristic/color temperature of the light source is detected by the lens, so that the white level is continuously set automatically, and the gain of the red and blue signals can be controlled even if the characteristic/color temperature is changed. .
ALC/ELC (Automatic Brightness Control/Electronic Brightness Control): When the ELC is selected, the electronic shutter continuously and automatically changes the exposure time of the CCD image sensor according to the brightness of the incoming light (usually from 1/50 to 1/10000 second) . When this option is selected, the ALC auto iris lens can be replaced with a fixed or manual iris lens. ?
It should be noted that in outdoor or bright environments, because of the limited range of ELC control, ALC lenses should be selected; under certain unique lighting conditions, the following situations may occur:
1 There is a strong smear or blurring on a high-luminance object such as a spotlight or window.
2 The image flickers significantly and the color reproducibility is unstable.
3 The white balance changes periodically. If these phenomena occur, use the ALC lens. When using a fixed iris lens with ELC, the depth of field of the image may be less than the depth of field obtained with an ALC lens. Therefore, when the camera uses the ELC mode to fully open the fixed iris lens. Depth of field is smaller than when using an ALC lens, and distant objects on the image may not be in focus. When the lens is an auto iris lens, the switch needs to be set to ALC mode.
BLC ON/OFF (Backlight Compensation Switch): When powerful and useless background lighting affects the definition of important objects in the middle, the switch should be set to the ON position.
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