If you shoot video you will notice how quickly that you need a mounting system for your accessories. Even more quickly with the Black Magic Cinema Camera, or DSLR. The 15mm standard for video accessories is the sturdiest way to mount a matte box, follow focus, or other bits of gear. One thing you may have noticed is that these rails get expensive fast. Ill go more into details between the systems in a later post but I saw a set of 15mm rails and baseplate for under $30. I ordered a set of these myself, I’ll post my results when they arrive.