Inside the camera CCD or CMOS use day and night filter cause
the camera image partial color in the daytime, night vision low
illumination effect is poor, so day and night filter can't meet the
current CCTV surveillance industry application of high-definition
digital products, when the camera is color, it will automatically use
the pulse signal to make the switch move to IR CUT filter, taken out
such the camera image near the object of primary colors, nature. when
the camera is night vision, it use the pulse signal to make the switch
move to the AR filter once again, this image sensors can be induced to
the all wavelength of the light, so that the camera is better image
brightness and resolution, was made objects easier to identify.

IR-CUT filter:

Auto-regressive filter (AR-filter):

40 ohms resistor wire color is red and black 1.25 * 2 p * 80 mm * 0.6 mm.

Function:
1.
Fixed daytime color cast problems, enhancing the brightness at night.
IR-CUT filter switch automatically according to external light along
with the strength of automatic switching, making the image to achieve
the best results. That is, during the day or night, the dual filter can
automatically switch filters, therefore, whether in the next day or
night, can get the best imaging results.

 2. According to the
instruction automatic switch infrared cut-off and the full spectrum
glass, day and night switch, automatic positioning, in order to achieve
infrared end filter work during the day time, sunshine is vivid, restore
the true color. Full spectrum glass work at night, and increase low
illumination, night vision is very clear.

 3. Use on the camera
board, to modify the problem of partial color, out of focus, let video
images do not lose focus, unbiased color and excellent resolution.

 4. To filter the hard light to make the picture color soft, to accieve human eyes visual color.

Packaging included: 1pcs 20mm/22mm IR-CUT switch M12 lens mount holder

Remarks:
    Need Screw like below to mound this holder on camera board and fix lens.

Model: PM2.0x4 / PM2.0x5    
     L: 4mm / 5mm
     d: 2mm
     dk: 3.5mm
     K: 1.3mm