m12x0.5 ring cctv camera board lens black circle for fpv camera runcam len fixed ring m8 m12 lock rings diy rc drone quacopter spare parts

product feature: lock ring m12x0.5 for s-mount lenses the lock ring m12x0,5 should be attached on the thread of a s-mount lens before screwing the lens in the basler dart camera. the focus of a s-mount lens is adjusted by changing the intrusion depth of the lens in the camera mount. the optimum intrusion depth of the lens can be fixed by tightening the lock ring on the lens threat at the beginning of the mount.