Auto Iris Varifocal Lenses allow you to adjust the coverage area of the camera without having to move the security camera or install a different security camera lense. These Auto Iris lenses are designed for outside or any application where the lighting conditions are variable.
Manual Iris Varifocal Lenses can be adjusted to fit the needed coverage area of the specified security camera. However since these are manul iris varifocal lenses you’ll have to adjust these manually. Manual iris varifocal lenses are best used where lighting is consistent or the camera is readily available.
Varifocal Lenses means that the focal length of the lense can change. A shorter focal length (e.g. 2.5mm) would have a wider angle of view. These varifocal lenses with a shorter focal range would be ideal in places such as driveways, store frontage and cash registers. Varifocal Lenses come in auto and manual iris.
Varifocal Lenses come in different ranges of adjustment. The different focal lengths, measured in millimeters translate into different viewing angles. Larger Varifocal Lenses (in the range of 5.0mm-100mm) would be ideal to view down a long hallway, stairway or to focus on items further away. Varifocal lenses come in both manual and auto iris.