Monitor the camera focal length 3.6mm 4mm 6mm. What is the meaning?
Mm is the lens of the aperture, the number of millimeters, not the bigger the better, the smaller the camera according to the wider picture, the larger the lens the more narrow the picture clear
Large number of millimeters of the lens is equivalent to the local zoom, according to the needs of the venue, the size of the number of millimeters of the lens price is the same, there is a picture below you look to understand, hope to adopt
