What kind of lens combines both adjustable focal length and autofocus capabilities?

A zoom lens is designed to provide both adjustable focal lengths and autofocus capabilities, making it versatile for various shooting scenarios. The adjustable focal length allows users to zoom in and out, capturing subjects at different distances without needing to switch lenses. This flexibility is especially useful in dynamic environments where the distance to the subject can change rapidly.

Moreover, the autofocus feature in zoom lenses aids in maintaining sharp focus on subjects as you adjust the zoom. This combination of attributes makes zoom lenses highly popular in both photography and videography, where quick adjustments are often required to achieve the desired framing and focus.

In contrast, while varifocal lenses also offer adjustable focal lengths, they may not necessarily have advanced autofocus capabilities, making them less versatile than zoom lenses in certain contexts. Fixed lenses have a single focal length and do not offer zooming or focusing flexibility. Standard lenses can encompass a variety of types, but without specifically being a zoom lens, they cannot ensure both an adjustable focal length and autofocus capability as effectively. Thus, the combination of adjustable focal lengths and autofocus functions makes the zoom lens the ideal choice in this scenario.