What device is used to stabilize tripod legs and prevent them from moving too far apart?

A spreader is specifically designed to stabilize the legs of a tripod, ensuring they do not move too far apart and maintaining a stable platform for equipment. The spreader connects the tripod legs, often with adjustable arms, providing a secure base that helps prevent the tripod from tipping over or becoming unstable, especially when supporting heavy cameras or equipment.

By keeping the legs at a consistent distance apart, the spreader enhances the overall stability of the tripod, which is essential in both photography and videography. This stability is critical during long exposures or when capturing video footage, as any movement can lead to blurred images or shaky camera work.

The other options do not serve this purpose: a jib arm is used for camera movement and angles, the aperture refers to the opening in a lens that controls light entry, and a quick release plate allows for the fast mounting and unmounting of a camera from the tripod but does not stabilize the tripod itself.