IP cameras come with one of three lens types and this is how our product lines are differentiated. Fixed lens cameras have a focal point and angle of view that are not able to be modified.
A Varifocal Zoom Lens can Help You Zoom In on Long Distance Targets
If you need to recognize a face at a further distance than a fixed wide angle camera allows, you can get more distance by going with a camera with a optical zoom lens.
The second line of images in this example are from our motorized varifocal zoom series.
Varifocal zoom cameras have lenses that allow you to optically adjust (manually or by motor) the viewing angle and focus of a camera. The most common form of vari-focal is wide angle 2.8mm to telephoto 12mm. The terms sound complicated, but you've actually done this a ton of times already. Every time you twist the lens of a DSLR camera or push the zoom button on a digital camera, you are changing the focal length and viewing angle. In photography, we call this "zooming," but in surveillance we call these types of cameras "varifocal."
Both vari-focal and Pan Tilt Zoom (PTZ) Cameras have the ability for you to choose your viewing angle and level of zoom, but PTZ cameras are more expensive and can Pan and Tilt as well as Zoom (that's where we get PTZ). PTZ can be controlled remotely via a joystick. The viewing angle and level of zoom for a vari-focal camera must be changed in person.