1. The top can be rotated and placed flat on the desktop to protect the lens (it will not scratch the desktop) 2. Upgraded buckle method, opening/closing the buckle only takes 1 second (abandoning the traditional screw lock design) 3. Universal bottom quick release interface, reserved ac quick release port, ace quick release port, and 1/4 screw hole, which can be quickly released with ac and ace bases 4. High cost performance