What is the primary benefit of using a varifocal lens in Axis cameras?

Using a varifocal lens in Axis cameras offers the significant advantage of optimizing framing for different scenarios through its adjustable focal lengths. This flexibility allows users to tailor the camera's field of view to the specific requirements of a scene, adjusting the lens to zoom in on particular subjects or areas of interest, or zooming out to capture broader environments. This is especially beneficial in surveillance applications where the focus might need to shift depending on the situation, such as monitoring a wide area for security or zooming in on a specific activity.

Additionally, the adaptability of varifocal lenses means that they can be used in a variety of settings without the need to replace the lens for different applications, making them a versatile choice for various surveillance tasks. This feature is particularly useful in dynamic environments where the requirements for video coverage may change frequently.

The other options, while related to camera functionality, do not accurately describe the core advantage of varifocal lenses. Specifically, fixed focal lengths do not provide the adaptability needed for changing scenarios, wider angles and less distortion are generally associated with specific lens designs rather than a varifocal feature, and low-light performance typically relates more to the sensor and lens quality than to the focal length adjustability provided by varifocal lenses.