DSLR 15mm Rod Cheese Baseplate Mount Rig For Mattebox Follow Focus 5D2 5D3 550D This cheese base plate allows you to DSLR cameras 5D2 5D3 GH1 GH2 etc. There is a spacer between knob and clamp, it can protect the knob and clamp from scratch. The Rails mount height is suitable for gear follow focus to lens gear ring.