If you’ve had a go at shooting video for any length of time with any camera that has a DSLR or mirrorless-like form factor, you soon realise that you need some form of cage. You need to attach handles, lights, microphones, external batteries and all kinds of doohickies. Sure, you have a cold shoe on many cameras, but you can only attach one thing to that.
When it comes to the Blackmagic Pocket Cinema Camera 4K, there isn’t even a cold shoe. There’s just a 1/4-20″ screw thread, and it can’t handle a lot of weight attached to it. The solution to this problem is to add a cage.