A narrower view with more detail at distance
The 4 mm lens has an 85° horizontal field of view. Compared with the 2.8 mm version, less of the surroundings fits in the frame, but people and objects further away appear larger and are easier to make out. It suits a long corridor, a gate or door, a checkout or a loading area, where seeing who is coming matters more than covering the whole room at once. The image is 5 MP at 2880 × 1620 and 25 frames per second.