Abstract: Systems, measuring devices, and methods that continuously and automatically adjust the focus of a lens of a motion camera are described. A measuring device includes one or more infrared components that generate and receive one or more infrared signals for measuring a distance, a processing device, and a non-transitory, computer-readable storage medium. The non-transitory, computer-readable storage medium includes one or more programming instructions that, when executed, cause the processing device to continuously obtain data corresponding to a distance between a target object and a lens coupled to a motion camera from the one or more infrared components, determine one or more position parameters of the lens that corresponds to a focused image of the target object, and transmit the one or more position parameters to a lens controller, thereby causing the lens controller to adjust a positioning of the lens to correspond to the position parameters.