The 1/3"5-50mm we recommended lens.
This is an auto iris lens, which maintaining correct exposure when you use a high speed fixed shutter. It comes with IR correction function; IR corrected not only for IR, but will have the correct function for all light.
You know the sunlight during the day, while the sun ranges from ultraviolet 100NM to infrared 1000NM, full spectrum of light, but at night, our secondary light source is a single spectrum, or may be 650NM or 600NM, this time because the refractive index is different for each wavelength, it will cause the target object can not correct focused on CCD of the camera. Back focus length will move because the conversion of day and night, therefore, professionals will use the lens with IR corrected function to control it, to ensure a clear image.
It can guarantee that you can clearly see both day and night, regardless of the weather change.