Here is another smartphone accessory that lets you capture videos and photos like a pro. The Ulanzi O-LOCK iPhone Grip Holder has an ergonomic design, allowing you to record more steady videos. It has a cold shoe mount for your light. It also has 1/4″ screw holes, so you can easily mount it to your tripod.
This iPhone grip holder lets you shoot video horizontally or vertically. It also has a desktop stand mode. It comes with a detachable remote control with a range of about 10 meters. It weighs only 126g, so you can easily handle it without getting tired. More information is available here.